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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Fri Sep 23, 2011 11:28 am Post subject: |
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okay a lil update, im not even sure if anybody reads this hahaha
but il keep it as my documentary
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 |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Fri Sep 23, 2011 11:33 am Post subject: |
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heres the other sets of pictures
from the port entry , viewing one side of the port into the throat area/backside of the intake valve
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
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 |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Fri Sep 23, 2011 11:41 am Post subject: |
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chamber shot.. viewing the exhaust port entry after the valve
visible also the intake side
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
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
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 |
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Matthew Samba Member
Joined: January 29, 2004 Posts: 1760 Location: Eastern Tennessee
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Posted: Sat Sep 24, 2011 1:12 pm Post subject: |
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Good stuff. Keep posting it up. I love a good running sp engine. _________________ 1965 Beetle sedan
Click to view image |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Sat Sep 24, 2011 11:52 pm Post subject: |
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thanks man
il def have more updates in a few
_________________ Flow Through a Curved Conduit
porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Sun Sep 25, 2011 2:03 pm Post subject: |
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Those intake ports have a long way to go bro
Don't hold back on them! pull those guides and make them SMOOTH
ain't like your gonna hit water |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Sun Sep 25, 2011 4:29 pm Post subject: |
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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
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 |
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DarthWeber Samba Member
Joined: November 24, 2007 Posts: 7543 Location: Whittier,CA
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Posted: Sun Sep 25, 2011 5:33 pm Post subject: |
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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
ain't like your gonna hit water |
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. |
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RockCrusher Samba Member
Joined: August 03, 2010 Posts: 4596 Location: Parkesburg, PA
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Posted: Sun Sep 25, 2011 6:20 pm Post subject: |
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I wouldn't suggest going until you hit air either. 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. |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Sun Sep 25, 2011 6:23 pm Post subject: |
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we dont get the devcon locally
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 |
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RockCrusher Samba Member
Joined: August 03, 2010 Posts: 4596 Location: Parkesburg, PA
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Posted: Sun Sep 25, 2011 6:35 pm Post subject: |
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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. |
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fivelugshortaxle Samba Member
Joined: May 13, 2011 Posts: 4254 Location: Aumsville, Oregon
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Posted: Sun Sep 25, 2011 6:39 pm Post subject: |
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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 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 |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Sun Sep 25, 2011 7:31 pm Post subject: |
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paul the way u make it sound... makes it sound not "a lil more then im happy"
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 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Sun Sep 25, 2011 8:17 pm Post subject: |
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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. |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Mon Sep 26, 2011 2:39 am Post subject: |
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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 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Mon Sep 26, 2011 2:59 am Post subject: |
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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 , 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 |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Mon Sep 26, 2011 3:11 am Post subject: |
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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 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Mon Sep 26, 2011 3:38 am Post subject: |
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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. |
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ralf Samba Member
Joined: July 08, 2008 Posts: 1215 Location: r4
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Posted: Mon Sep 26, 2011 3:44 am Post subject: |
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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 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
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Posted: Mon Sep 26, 2011 3:56 am Post subject: |
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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 |
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