My Big Bore '40hp' build

jasengine · Posted: Sat Feb 25, 2017 12:27 pm Post subject: Re: My Big Bore '40hp' build

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.

jasengine · Posted: Wed Feb 15, 2017 4:57 am Post subject: Re: My Big Bore '40hp' build

Now ready for run in:

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spanky324 · Posted: Tue Feb 14, 2017 4:28 pm Post subject: Re: My Big Bore '40hp' build

Nice setup

jasengine · Posted: Tue Feb 14, 2017 5:38 am Post subject: Re: My Big Bore '40hp' build

Test stand:

The eagle eyed amongst you may have spotted I changed the fan housing for the earlier type to give more clearance on the carbs.

jasengine · Posted: Mon Feb 13, 2017 9:21 am Post subject: Update

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:

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.....

jasengine · Posted: Wed Mar 18, 2015 2:27 am Post subject: update

Two hours later and they fit Smile

jasengine · Posted: Mon Mar 16, 2015 5:45 am Post subject: Update

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

jasengine · Posted: Wed Jan 14, 2015 5:50 am Post subject:

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)

spencerfvee · Samba Member Joined: August 19, 2004 Posts: 3071

Hi super cool build .keep up the good work .this has nothing to do with your build and if you don't mind me asking in my state of ohio gas is $1.78 gal.has gas gone down in the UK ? Thanks spencerfvee

jasengine · Posted: Sun Jan 11, 2015 6:33 am Post subject: Update

A bit of progress, it's slow though as parts are so expensive.

No 3,4 oil drain back to sump.

jasengine · Posted: Sun Aug 03, 2014 2:27 pm Post subject:

Bit of an update. Got some second hand twin Dellorto DRLA 40's, jetted pretty nicely for my application as it happens!
I bought a set of manifolds from CSP Performance in Germany and hex bar linkage: The quality is fantastic.

Ive taken off the 'single port' oil cooler, as I thought its better to be safe. So Ive managed to get an original twin port fan housing and will get the oil cooler to suit.

jasengine · Posted: Thu May 08, 2014 10:53 am Post subject:

Actually, looking at things more closely, I can't see a lot for £200 of porting, can you? The exhaust valves haven't been touched and the ports themselves are hardly touched compared to what I had done previous to sending them off!

Now call me old fashioned, but arnt valves surposed to be lapped in for and complete seal....yes they are if a job is to be done properly!

jasengine · Posted: Thu May 08, 2014 9:42 am Post subject:

They sit nicely on the cylinders with the counter-bore clearing the fin root. I can now play arround with the rocker geometry; I think I will have to get some soft springs so I can move the valves and get the elephant feet positioned correctly at half lift.
Few more pics (hose was temporary to get oil circulated to all areas.

Springs are single HD Scat.

jasengine · Posted: Thu May 08, 2014 6:44 am Post subject:

Update :
Got the heads back from being ported and cc for 9:1 compression.
The sharp-eyed amongst you may notice the counter bore to give cylinder clearance.
At last I can progress the build.

jasengine · Posted: Mon Feb 24, 2014 2:10 am Post subject: Springs

I am really not sure if I need to use HD springs with the C25 cam. The engine is going to be rev limited to 5.5k. I have the springs that came with the cam, but I also have some stock springs that came with the 1600 heads.

Comments please.....

jasengine · Posted: Fri Feb 07, 2014 3:15 pm Post subject:

Been match porting the intakes; never done it before, you cant really see much but every little helps I guess.

jasengine · Posted: Mon Feb 03, 2014 9:12 am Post subject:

Just been doing some trimming of the tin under the pulley so it clears the oil take off for the full flow filter and cooler. I also found out that the scat power pulley bolts up far too close to the tin and even with trimming, so I had to turn up a 3mm spacer to go on before the pulley to move it out!

jasengine · Posted: Wed Jan 01, 2014 4:27 am Post subject:

Haha, good point, I did wonder if it was the right way! Thanks

Aaron M265 · Posted: Tue Dec 31, 2013 8:59 pm Post subject:

Turn your oil filler baffle clockwise 90'.
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jasengine · Posted: Tue Dec 31, 2013 11:44 am Post subject: Update

I got the 1600 twin port heads....

Just got to reduce the head volumes now at they are 54.5cc and I need 43cc. I'm going to get them welded up instead of machined and then shape them.


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My Big Bore '40hp' build
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