Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
My Big Bore '40hp' build
Page: Previous  1, 2, 3
Forum Index -> Vintage Speed 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
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Wed Jan 14, 2015 5:50 am    Post subject: Reply with quote

Spencerfvee. Thanks for your comment. Yes gas has come down in the UK to @ £1.13 / Litre (for diesel! - my daily driver is a TDI)
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Mon Mar 16, 2015 5:45 am    Post subject: Update Reply with quote

DRLAs are proving to be a squeeze. Some fan housing bashing required!!

Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Wed Mar 18, 2015 2:27 am    Post subject: update Reply with quote

Two hours later and they fit Smile

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


Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Mon Feb 13, 2017 9:21 am    Post subject: Update Reply with quote

Been a while since Ive updated this, so here is on the test stand ready for it's first start, once I get the correct number of shims for the generator pully:

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


Ive fitted the plug wire since this shot!

I'll get some shot of the test stand I made from an engine stand and an old gearbox.....
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Tue Feb 14, 2017 5:38 am    Post subject: Re: My Big Bore '40hp' build Reply with quote

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


The eagle eyed amongst you may have spotted I changed the fan housing for the earlier type to give more clearance on the carbs.
Back to top
View user's profile Send private message Classifieds Feedback
spanky324
Samba Member


Joined: September 28, 2006
Posts: 1045
Location: Greeley Pa
spanky324 is offline 

PostPosted: Tue Feb 14, 2017 4:28 pm    Post subject: Re: My Big Bore '40hp' build Reply with quote

Nice setup
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Wed Feb 15, 2017 4:57 am    Post subject: Re: My Big Bore '40hp' build Reply with quote

Now ready for run in:

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


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


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


Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Yesterday 12:27 pm    Post subject: Re: My Big Bore '40hp' build Reply with quote

I got it started for the first time today. After some fuel starvation and re primed the carbs, it fired and I took the revs up to 3000 and kept it there. The exhaust started to smoke more and more, to a point where I thought this wasn't right and shut it down, but before I did, I noticed the oil pressure was around 100psi !!! This isn't right, even for a new engine, is it? The oil is miller's break in oil, 30w.
I inspected all over and noticed oil dripping from no. 3/4 head push rod tubes at the head end.
I haven't inspected any further, as I wanted to let it all cool down.

I need to check if I got a standard oil relief spring on the return to the case. It's been a few years since I built it! I remember installing the HD oil cooler bypass spring, but then installing the standard one again after reading about it not being necessary.
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Yesterday 3:56 pm    Post subject: Re: My Big Bore '40hp' build Reply with quote

Additional:
I took the plugs out tonight and inspected them. Cylinders 1/2 were sooty, 3/4 less so. No sign of oil on them either.
I took out the oil pressure valve at the flywheel end and it was the standard spring. So perhaps this high oil pressure is due to the cold 30w oil and 3000rpm. The smoke, incidentally was not blue, more grey. I will fire her up again tomorrow and check again, maybe lower revs to 2500 and see if there is any change.
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Today 10:57 am    Post subject: Re: My Big Bore '40hp' build Reply with quote

Ok on reflection, the first possible reason why the oil pressure is reading so high is the sender is a VDO unit, but the gauge is some other make... With 100psi I'm sure I would see a few other problems showing them selves.

So apart from that, I've re sealed the rod tubes on one head: I don't like these big bore spring loaded tubes, they're too wide and don't allow the seal to seat fully against the head.
I noticed a bit of flooding in one carb vent. so took the float out and re-measured the distance between float and the cover, which was about 1mm out. Both carbs need slight adjustment, so cutting a long story short it cured the flooding.....until I notice fuel pissing all over the floor! It was coming from the mech. fuel pump! On investigation and pump strip down,the metal part of the diaphragm had pulled apart. Crappy cheap replacement pump parts?? It looks like the metal discs were only pressed together. Better this happened now and not down the road!
Back to top
View user's profile Send private message Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Today 11:56 am    Post subject: Re: My Big Bore '40hp' build Reply with quote

Pump internals:

Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Classifieds Feedback
txoval
Samba Member


Joined: August 18, 2007
Posts: 1093
Location: The Woodlands, TX
txoval is offline 

PostPosted: Today 12:14 pm    Post subject: Re: My Big Bore '40hp' build Reply with quote

New engine startup/break-in RPM's should be 2000 for 20 minutes...not 3000
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
jasengine
Samba Member


Joined: June 07, 2012
Posts: 66
Location: Wiltshire, UK
jasengine is offline 

PostPosted: Today 12:52 pm    Post subject: Re: My Big Bore '40hp' build Reply with quote

Quoting from aircooled.net :

"Immediately bring the RPM’s up to 2000 or higher. We like to vary the RPM’s between 2000 and 3000, and do this for 15 minutes while keeping your eyes glued to the oil light!"

So perhaps I can bring it down a bit Very Happy
Back to top
View user's profile Send private message Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Vintage Speed All times are Mountain Standard Time/Pacific Daylight Savings Time
Page: Previous  1, 2, 3
Page 3 of 3

 
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 © 1996-2016, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB