Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
my lil singleport engine project/build
Page: Previous  1, 2, 3, 4, 5, 6  Next
Forum Index -> Performance/Engines/Transmissions Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Fri Sep 23, 2011 11:28 am    Post subject: Reply with quote

okay a lil update, im not even sure if anybody reads this hahaha


but il keep it as my documentary

Image may have been reduced in size. Click image to view fullscreen.

sp heads, i recently disassembled off my dad's tired stocker,
in all its vintage glory.. vintage = crude , caked up, soiled up oil hahaha

i gave it a shot of cleaning using dishwashing soap..

i wish i had those superclean detergent that RC/modok and the rest were talkin about in another thread sigh...

i did some minor shaping and cleaning up on the ports, rough
then decided to make a pass using 80grit rolls just to see it cleaner for visualizing , il rough it up and shape it some more in the
next couple of days
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Fri Sep 23, 2011 11:33 am    Post subject: Reply with quote

heres the other sets of pictures

Image may have been reduced in size. Click image to view fullscreen.


from the port entry , viewing one side of the port into the throat area/backside of the intake valve


Image may have been reduced in size. Click image to view fullscreen.

heres another angle ,

some areas can be seen that is left untouched, i was trying to
clean up some sections just to ease flow and all
without hogging it too much

Image may have been reduced in size. Click image to view fullscreen.

a shot from the chamber into the intake ports

next would be some exhaust pictures
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Fri Sep 23, 2011 11:41 am    Post subject: Reply with quote

chamber shot.. viewing the exhaust port entry after the valve
Image may have been reduced in size. Click image to view fullscreen.

visible also the intake side


Image may have been reduced in size. Click image to view fullscreen.

heres the other exhaust side


ive done a lil bit of guide boss shaping on the exhaust port
il prolly just smooth it out a bit more and keep it this way..
not really looking for all out power etc , might help let the guides/valves last longer with more support i guess

Image may have been reduced in size. Click image to view fullscreen.


exhaust port , il prolly just make another pass on 80grit to completely clean the ports, without hogging.. looks to be an alright shape just a
few lil areas id like to touch up after

Image may have been reduced in size. Click image to view fullscreen.


another shot with different lighting ,


tomorow il do the other head, to bring it up to speed with this one..
then proceed to working on them both..


should i sandblast the chambers with mock up valves just to get it clean?
i know sand sticks in some areas we dont want but
the head will have the guides removed and seats replaced

yey or nay?


hopefully id have more updates in a few days during the porting sessions

oh and pardon these latest pics.. im using my crappy phone to take pictures
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
Matthew
Samba Member


Joined: January 29, 2004
Posts: 1760
Location: Eastern Tennessee
Matthew is offline 

PostPosted: Sat Sep 24, 2011 1:12 pm    Post subject: Reply with quote

Good stuff. Keep posting it up. I love a good running sp engine.
_________________
1965 Beetle sedan
Click to view image
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Sat Sep 24, 2011 11:52 pm    Post subject: Reply with quote

thanks man Very Happy

il def have more updates in a few


Cool
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26743
Location: Colorado Springs
modok is offline 

PostPosted: Sun Sep 25, 2011 2:03 pm    Post subject: Reply with quote

Those intake ports have a long way to go bro
Don't hold back on them! pull those guides and make them SMOOTH Twisted Evil

ain't like your gonna hit water Wink
Back to top
View user's profile Send private message Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Sun Sep 25, 2011 4:29 pm    Post subject: Reply with quote

for sure glen!!

haha i juz did a pass on 60grit just to see how it looks

it is def not even within 40% of work


will need to pull the guides now because the rest of the portwork is being obstructed Cool

some updates in a couple of days
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
DarthWeber
Samba Member


Joined: November 24, 2007
Posts: 7543
Location: Whittier,CA
DarthWeber is offline 

PostPosted: Sun Sep 25, 2011 5:33 pm    Post subject: Reply with quote

modok wrote:
Those intake ports have a long way to go bro
Don't hold back on them! pull those guides and make them SMOOTH Twisted Evil

ain't like your gonna hit water Wink


WhAt GlEn SaId!!!

Go Ralf!, Go Ralf!, Go Ralf!
_________________
Mitey62 wrote:
Swapped the Compufire for a Bosch blue and some points I had sitting around, started 1st crank. Took her out for a drive, pulls harder, more RPM, and runs smoother. I think I'll be sticking with points from now on.

RockCrusher wrote:
JB weld the case halves....that'll keep the fretting to a minimum. Laughing
Back to top
View user's profile Send private message Gallery Classifieds Feedback
RockCrusher
Samba Member


Joined: August 03, 2010
Posts: 4596
Location: Parkesburg, PA
RockCrusher is offline 

PostPosted: Sun Sep 25, 2011 6:20 pm    Post subject: Reply with quote

I wouldn't suggest going until you hit air either. Laughing Laughing But there is always Devcon F for aluminum. Done some V-8 intake manifolds that required quite a bit of filling with the stuff around the plenum.
_________________
[email protected] Please use email for all general inquiries.

I will be happy to speak to anyone who has a serious inquiry (meaning real potential business for RC enterprises) or a parts order. Due to machining noise causing missed calls all calls will be returned promptly.
Back to top
View user's profile Send private message Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Sun Sep 25, 2011 6:23 pm    Post subject: Reply with quote

we dont get the devcon locally Sad


but once i get ahold of it.. there will be some good sessions between me and devy haha


once i get the guides removed , il proceed to conintuing the "shaping" of the intakes, the exhaust a lil more and im satisfied
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
RockCrusher
Samba Member


Joined: August 03, 2010
Posts: 4596
Location: Parkesburg, PA
RockCrusher is offline 

PostPosted: Sun Sep 25, 2011 6:35 pm    Post subject: Reply with quote

It's a design flaw when you see the heads with no material around the exhaust valve guides. Start right at the rear top of those exhaust guides and work a trough around and down to the sides to meet the floor where the rest of the aluminum of the guide support meets. This is equivalent to the rounded nose of an airplane at subsonic speed and how it parts the air. Do not make the material behind the guide sharp or pointy. You need to widen the port side in the pocket beside the troughs. Bluntly colliding with the back of a bare guide is not efficient flow.

Don't ask me anything about intake ports because I won't talk about those or chambers.

RC
_________________
[email protected] Please use email for all general inquiries.

I will be happy to speak to anyone who has a serious inquiry (meaning real potential business for RC enterprises) or a parts order. Due to machining noise causing missed calls all calls will be returned promptly.
Back to top
View user's profile Send private message Classifieds Feedback
fivelugshortaxle
Samba Member


Joined: May 13, 2011
Posts: 4254
Location: Aumsville, Oregon
fivelugshortaxle is offline 

PostPosted: Sun Sep 25, 2011 6:39 pm    Post subject: Reply with quote

RockCrusher wrote:
It's a design flaw when you see the heads with no material around the exhaust valve guides. Start right at the rear top of those Wink exhaust guides and work a trough around and down to the sides to meet the floor where the rest of the aluminum of the guide support meets. This is equivalent to the rounded nose of an airplane at subsonic speed and how it parts the air. Do not make the material behind the guide sharp or pointy. You need to widen the port side in the pocket beside the troughs. Bluntly colliding with the back of a bare guide is not efficient flow.

Don't ask me anything about intake ports because I won't talk about those or chambers.

RC


Hahahahah! Gotta keep a few secrets!
_________________
Good things come to those who wait.
2332 with lots of goodies....
Rotating assembly balanced by Brothers VW
4340 84mm crank
AA 94mm p&c' s
Total seal 2nd ring, rest are Grants
5.5 h beams
Magnum straight cuts
Steve Long XR310 on a 106
CB 1.4 rockers
CB Magnaspark 2 distributor
NGK D7ea plugs
A1 lowdown 1 3/4 with single muffler
Dellorto 48's with 40 venturies
Kennedy Stage 2 with Daiken disc
Back to top
View user's profile Send private message Send e-mail AIM Address Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Sun Sep 25, 2011 7:31 pm    Post subject: Reply with quote

paul the way u make it sound... makes it sound not "a lil more then im happy"


Cool


but good points indeed, thats the "a lil" work that i mentioned..

basically just flow aid work..
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26743
Location: Colorado Springs
modok is offline 

PostPosted: Sun Sep 25, 2011 8:17 pm    Post subject: Reply with quote

A article from Manley 15 years ago recommended that the exhaust guide should not project into the port unsupported for more than the diameter of the stem.
If it does, they say it gets hot more on one side than the other and causes wear problems from that.

I think they are right, so I shorten the ex boss a little, but I don't remove it.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Mon Sep 26, 2011 2:39 am    Post subject: Reply with quote

Sounds ideal modok !

Wat i had in mind was shape the guide boss some more , contour (like RC mentioned)

By the time the guides are removed it'd be ported some more

So i was planning to have the guides cut to the length/depth of the boss so it doesnt protrude nor does it sit deep , i was worried about guides gettin too hot , am i in the correct thinkint ?

Maybe thats why some heads with no exhaust boss have thicker OD guides ? To extend life?
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26743
Location: Colorado Springs
modok is offline 

PostPosted: Mon Sep 26, 2011 2:59 am    Post subject: Reply with quote

I'm sure you already had it planned the right way.

Just thought I'd mention it since we were on the subject, hell it's a miracle I remembered it

You know CB 044 has no boss at all Rolling Eyes, guide sticking way up. Then other people whack em' off flush, and that's not ideal either.

The article from manley was probably referring to installing .502 guides into heads that had integral guides before.
Of course, most "modern import" engines tend to follow the rule anyway, as you may have noticed Wink
Back to top
View user's profile Send private message Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Mon Sep 26, 2011 3:11 am    Post subject: Reply with quote

that is true on most imports, and this is what i do

when replacing guides on em' which is a rare case, an import head needing guides replacement
except when we upgrade to manganese

id profile the intake guides, and the exhaust is cut shorter to be more flush around the boss,

true on the 044's

my 043's from brothers has thicker OD exh. guides
possibly a way to solve/help the "no guide boss" exhaust maybe?

thanks Glen for the headsup

this is gettin me more excited
its been raining heavily here, with typhoons all around the metro haha
soon as it stops, il be havingg the guides removed, i cant wait to port some more without the guides protruding in places
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26743
Location: Colorado Springs
modok is offline 

PostPosted: Mon Sep 26, 2011 3:38 am    Post subject: Reply with quote

yep, my mx-5 uses special shorter EX guides, for more flow I guess
the other models of the same engine project out a little
Darn those modern engines, there's nothing to do, they are already perfect

Maybe those Brothers heads were late 70's fuel injection 043 heads in a past life? could be

I changed guides in some SP heads last week, smoothed around the intake guides a little while they were out, I just HAD to do it. OBSESSION

I'm still wonderin if the tapered seats are best
In a DP head, they keep the velocity up all the way to the valve, and keeps the port volume small for torque


But on the SP head, it's different, the air will have to slow down when it reaches the large "Y" in the port where it splits........ not much point in speeding it up again with the small seat.
Of course, you'll have to work hard to make the manifold side of the port big enough to even worry about that.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
ralf
Samba Member


Joined: July 08, 2008
Posts: 1215
Location: r4
ralf is offline 

PostPosted: Mon Sep 26, 2011 3:44 am    Post subject: Reply with quote

yeah.. im thinking of that side of things also...

about the taperd BERG style seats, we already know the merits and purpose on a DP head, whereas on an SP head it generally already has higher airspeed/turbulence so.. im also thinking.. could prolly just get regular PEP/bugpack intake seats? im sure the taperd seats for the exhaust should work still.. the exhaust ports are the same on DP


....
yeah you're right those 043s could be old injected heads
but theyre brand new , like the autolinea 043's

so unless they came from the factory with fatter exhaust? maybe somethings up there?
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk
Back to top
View user's profile Send private message Instagram Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26743
Location: Colorado Springs
modok is offline 

PostPosted: Mon Sep 26, 2011 3:56 am    Post subject: Reply with quote

the regular seat for 37mm valve is straight 33.3mm ID I think, and is a little smaller so it won't be too close to the spark plug.
Seats are cheap, might as well get those

The ex seats ought to be slick, since they have a little extra material you can blend them into the port SEAMLESS Very Happy
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Performance/Engines/Transmissions All times are Mountain Standard Time/Pacific Daylight Savings Time
Page: Previous  1, 2, 3, 4, 5, 6  Next
Page 3 of 6

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2023, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.