Thread: Long Rod VE Engine build

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2011-09-30 02:08:02

#41

vumnoo

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Originally Posted by jRod

you cannot safely go 88mm on stock sleeves. they will be way too thin....

Mike had failures on his sleeves bored to 87mm on a 550+ whp turbo DE-T (granted, I believe his investigation yielded some results that the block had been overheated multiple times in the past, so that may have contributed)...

I bored my turbo DE-T to 87.5mm and that's as far as Rebello was comfortable going to and as far as anyone should go... and that's being damn sure you have a good square block and all the prep and machining has been done properly.

Looking back, it would've been smart foe me to just sleeve it for future "expansion" but I wasn't in contact with Darton or any other places that would do it for a reasonable price in those days.

Nowadays for the cost of the sleeves ($350ish) + $500-550 Darton will sleeve your block and stand behind their work and the sleeves. You cannot beat that. And if you can you will probably be replacing sleeves often

Also, IIRC the Cometic Headgaskets for the SR20DE/T are all 88.5mm bore. So you use the same part number for an 86, 87 or 88mm engine the only thing that changes the HG configuration/part # would be the thickness...

Those are all turbo builds, we're talking N/A. There is a difference of a bajillion between the two (that's an legitimate measurement amount, just like a sh1tload is...).

That being said, I'm collecting parts for a 90mm sleeved build.

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2011-09-30 09:57:56

#42

Doctor G

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I know our local touring car series used to bore the blocks to 88mm. And before anyone says "but they rebuild those motors after every race or two" - no, they don't. Some of those motors have found their way into street cars after the touring car thing ended, and some of them are still being run by privateers in other forms of racing. All n/a off course.

That being said my brother in law is running a 87.5mm setup on a DE with some other bits and to date no N1 cammed VE can catch him. Motor takes a lot of abuse and holds up just fine. Running a 88mm Cometic gasket.

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2011-09-30 10:01:12

#43

STRATTON

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U the man doctorg ! Amazing what 2mm can do.

Stratton.

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if ruled the world and everything in it, skys the limit id push the q 4 5 infinit....

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2011-09-30 10:06:55

#44

Doctor G

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True, but there also the 300+ Deg cams, 13mm + Lift, itb's etc.

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2011-09-30 11:11:27

#45

TheSam

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Strat has it right gtir blocks bored to 88mm was the touring car thang.

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2011-09-30 11:22:16

#46

kiwi-japie Online/offline status of kiwi-japie is unknown

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Originally Posted by STRATTON

U the man doctorg ! Amazing what 2mm can do.

Stratton.

1.5mm!!!

Originally Posted by Doctor

That being said my brother in law is running a 87.5mm setup on a DE with some other bits and to date no N1 cammed VE can catch him. Motor takes a lot of abuse and holds up just fine. Running a 88mm Cometic gasket.

I find this hard to believe. Not even Derm's old VE before he went big bore?

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2011-09-30 11:31:51

#47

STRATTON

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Originally Posted by TheSam

Strat has it right gtir blocks bored to 88mm was the touring car thang.

Originally Posted by Doctor
I know our local touring car series used to bore the blocks to 88mm. And before anyone says "but they rebuild those motors after every race or two" - no, they don't. Some of those motors have found their way into street cars after the touring car thing ended, and some of them are still being run by privateers in other forms of racing. All n/a off course.

Originally Posted by kiwi-japie

1.5mm!!!

Stratton.

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if ruled the world and everything in it, skys the limit id push the q 4 5 infinit....

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2011-09-30 20:05:23

#48

Doctor G

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Originally Posted by kiwi-japie

I find this hard to believe. Not even Derm's old VE before he went big bore?

derm's ve not a fair comparison. Big difference in chassis weight.

I'm referring to other street ve's without built internals, but with n1 cams and the usual bolt ons.

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2011-09-30 20:31:53

#49

blackwater32 Online/offline status of blackwater32 is unknown

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Never heard of touring car sr's being bored out to 88mm. I know they were limited to 2000cc and the btcc p10 were 86x86, 8500 rev limit, and 12:1 compression ratio. Idk how you get the displacement under 2000cc with 88mm bore.

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2011-09-30 20:36:54

#50

jRod

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Its all a question of figuring out the stock sleeve thickness (outer diameter - inner diameter) at 86mm and then subtracting an additional 2mm + whatever tolerance for clearance/rings etc to determine the actual thickness of the sleeve.

Once that is known we can determine strength values based off of material properties and basic mechanics.

If youre gonna spend the money on a custom piston you may as well sleeve and go 90mm

I still think the stock sleeve would be very very thin.

yes turbo engines see more abuse than NA, I'm not an idiot....but how much hp are you expecting to make from going 87 to 88? and how long do you want the engine to last, more importantly.

I also am not aware of the touring cars being 88mm. Not saying you're wrong or making it up, I just don't know the history on those engines...

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