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Question On Pon Cams

writeoff

By writeoff,
in Engines & Forced Induction

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Mr. Keets Grand Master

Mr. Keets

Posted
Posted

David-Gutted to read the Bentley thread...horrible luck

As for the sump baffle; from what i'm told its an engine out exercise best left for a rebuild occasion. When I brought that idea up last year the consensus was run my RB with an extra litre or so of oil..I use redline just incase anyway.

wrxhoon Grand Master

wrxhoon

Posted
Posted

.

However dyno figures can give an indication of when the turbos come on boost which is what I'm interested in
I'm not even sure that you can do that. I get full boost (1.1 bar) in my car at around 3800 on the higher 3 gears but don't forget I have a 34 engine and very healthy one as well.

Sory to hear all your misfortunes.. Have you had a full check up on your engine? ( the one the turbo let go ) If not, if I was you I would do a full compression test and a leakdown before doing any mods to it .

These engines have a bad habit of sucking turbo ceramic dust back in them. When it happened to me a few years back no-one believed me but its happened to a few people here and now there are a lot more believers...

This is what could have happened to yours ( but i hope not). This is extreme as you can see the 3 pistons ( rear turbo let go so rear 3) are totally stuffed , the bore was the same and it was embebbed in the cyl head as well. The effected 3 cyls had very low compression( around 50-90) the other 3 had normal comp but were still effected ( very fine marks though).

post-5240-1169181344.jpg

post-5240-1169181372.jpg

writeoff Mentor

writeoff

Posted
  • Author
Posted (edited)
As for the sump baffle; from what i'm told its an engine out exercise best left for a rebuild occasion. When I brought that idea up last year the consensus was run my RB with an extra litre or so of oil..I use redline just incase anyway.

Thanks for the tip. I hadn't thought that far in advance.

Have you had a full check up on your engine? ( the one the turbo let go ) If not, if I was you I would do a full compression test and a leakdown before doing any mods to it.

I've had a leakdown test performed. I can't remember the exact results off hand but IIRC there was 5% variance between all 6 cylinders ie 5% difference between highest to lowest figures. I'll post the exact results when I grab the sheet. Ugly photos you have there. That must have hurt (both the car and your wallet).

Thanks to both Mr Keats and wrxhoon for your comments regarding the Bentley.

Edited by writeoff
R31Nismoid Grand Master

R31Nismoid

Posted
Posted
the grey GTR has a blown turbo (hense the upgrade),

I would be having the motor inspected, if a turbo has let go, then its possible there is some motor damage.

Also, you do know you really dont "need" the sump baffles ye?

The whole hype surrounding the need is pretty much that, hype.

Hardly any GTR's here in Melb run anything other than a stock sump well into the 300rwkw range, all circuit raced/motorkhana etc etc.

wrxhoon Grand Master

wrxhoon

Posted
Posted

[.

I've had a leakdown test performed. I can't remember the exact results off hand but IIRC there was 5% variance between all 6 cylinders ie 5% difference between highest to lowest figures. I'll post the exact results when I grab the sheet. Ugly photos you have there. That must have hurt (both the car and your wallet).

Was it a leakdown or compression test? Compression is quoted in either PSI or bar and you want as little variance as possible however a max of about 14 PSI . Leakdown is quoted in % and you want as little as possible ( less than 5% is very good) .

It did hurt because someone else was driving the car so I didnt even get the pleasure of blowing it up myself.

I only got the pain of rebuilding it, I had to change everything .

gun32gtr Grand Master

gun32gtr

Posted
Posted
[.

Was it a leakdown or compression test? Compression is quoted in either PSI or bar and you want as little variance as possible however a max of about 14 PSI . Leakdown is quoted in % and you want as little as possible ( less than 5% is very good) .

It did hurt because someone else was driving the car so I didnt even get the pleasure of blowing it up myself.

I only got the pain of rebuilding it, I had to change everything .

yeh thats why no longer let others drive my car now,read it couple times now and thought not worth..even tho id have to fix anyways..

writeoff Mentor

writeoff

Posted
  • Author
Posted
Also, you do know you really dont "need" the sump baffles ye?

I've deleted the sump from my list. Thanks for the advice.

Was it a leakdown or compression test? Compression is quoted in either PSI or bar and you want as little variance as possible however a max of about 14 PSI . Leakdown is quoted in % and you want as little as possible ( less than 5% is very good) .

It was a leakdown test. From memory the best figure was 7% and the worst was 12%.

A quick question: Are the Sard 700cc injectors a direct fit (as I believe) or do they need injector collars? http://www.nengun.com/sard/injectors

wrxhoon Grand Master

wrxhoon

Posted
Posted
A quick question: Are the Sard 700cc injectors a direct fit (as I believe) or do they need injector collars?

Yes , direct and the plugs fit, unlike the 800ccs, they can be a little tight in to the fuel rail but a little rubber grease makes them go in nice.

I would use new O rings and new collars but I use the old spacers if they look OK.

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
Yes , direct and the plugs fit, unlike the 800ccs, they can be a little tight in to the fuel rail but a little rubber grease makes them go in nice.

I would use new O rings and new collars but I use the old spacers if they look OK.

A slightly thinner o'ring does the trick nicely...don't forget to give them a light spray with silicone during assembly.

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