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Old 04-16-2002, 03:59 AM   #1
racerwad
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Question o-ringing: heads vs. block?

ok, i've heard a lot of talk about how "o-ringing" your motor will help create a better seal between the heads and block. when one uses the phrase "o-ringing" does that apply to the surface of the heads or the block, or both, or either? i mean, does it make a difference? thanks.

andy
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Old 04-16-2002, 08:05 AM   #2
Fitz
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9 times out of 10 peope o-ring the heads although I have seen it done to the block on big block dragsters.

Fitz
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Old 04-16-2002, 01:12 PM   #3
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Quote:
Originally posted by Fitz
9 times out of 10 peope o-ring the heads although I have seen it done to the block on big block dragsters.

Fitz
well everywhere else in the world(here) it's done on the block, i have seen one set of o-ringed heads...i'd do the block personally....but talk to your local machine shop and see what they say.

jeremy
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Old 04-16-2002, 02:11 PM   #4
racerwad
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thank you everyone. i just didn't know if it was an either or proposition. i assumed that it would be. has anyone seen better results with either o-ringed heads or blocks? thanks.

andy
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Old 04-16-2002, 05:30 PM   #5
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Well some people running the Aluminum SBF blocks o-ring all the passages on the block, and run w/o a head gasket. This means they don't leak coolant when warming up, and pulling the heads is a FREE operation as the whole thing comes apart and goes back together w/o needing to replace anything.
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Old 04-17-2002, 02:02 AM   #6
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I o-ringed the block, and far it holds 14 psi boost on race gas...
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Old 04-17-2002, 03:56 AM   #7
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Mine was wire ringed by Trey Cobb. We ran it up to 40psi on the engine dyno......with no problems (apart from me nearly havng a coronary

The EJ ** head gasket design is better suited to ringing the block.

Happy.
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Old 04-17-2002, 01:36 PM   #8
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Any harm / benefit from doing both?

And what does wire ringing entail?
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Old 04-18-2002, 02:07 AM   #9
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How do you run 40 psi on a street motor and not detonate the cr*p out of it?

What size turbo and IC are you using!!!

Larry

PS: I know about the pectel and 8 injectors...
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Old 04-18-2002, 03:37 AM   #10
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Larry,

It's low compression, about 8.5:1, MRT FMIC (also used for mapping on the engine dyno) fuel is European standard 97RON, and the minimum dose of NF octane booster (worth 2~3 deg' of extra ignition advance). I'm running about 20deg' at 30psi @ 7000rpm.

I've run octane booster since day one, because the car is a Jap STi, and mapped for Jap 100RON fuel. So I decided to map the new engine with booster.

The turbo is a Garrett GT35/40.

We tend to run much leaner than most of you guys, 11~11.5:1 afr, or a lambda voltage of circa .86~.87volts.

We also run higher egt's. I happily run up to 900C taken just before the turbo. This equates to about 1000C taken at the collectors. It's also only a little hotter than what the engine was running as stock. The new '02's seem to run ludicrously rich to me.

On the road I will run water injection, so I should be able to advance the igniton even further.

Happy.
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Old 04-18-2002, 05:15 AM   #11
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Ahhhh...

I run 9.4:1 compression, 24 degrees timing after using the ITC to pull back the stock ECU, run EGT's of 1450F, and am likely 12.5:1 AFR based on rear O2 sensor reading which read leaner than for real. So, I am stuck at 12 psi on a 70 degree day on 93 octane, 13 psi on 94 octane...

Still makes 350 crank at that...
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Old 04-18-2002, 05:40 AM   #12
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Larry,

I'm pretty certain that the US RON ratings are different to the Euro RON ratings, ie lower for the equivalent octane.

A stand alone will make a massive difference. The lowest we ran mine was 16psi @ 7000rpm, and that made 507bhp crank.

It would be worth you considering water injection.

Happy.
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Old 04-18-2002, 05:55 PM   #13
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I have been in discussion with Cascade Motorsports to get the Aquamist water injection system, but I first need to get my ProECM Willwood brake kit with MRT rotors installed. Then I can save for their 3D mapable 2s water injection system instead of the most basic "dump water in under boost" system.

Was gonna build my own water injection, and already have a dawes devices boost switch that is adjustable to set what level the WI starts at...

Larry
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