eduardocastrejon
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« on: March 08, 2011, 12:14:36 am » |
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Please help me with this
I want to know how much nitrous can I run safely with mahle 90.5 pistons ?
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eduardocastrejon
Junior
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« Reply #1 on: March 09, 2011, 12:28:53 pm » |
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I'm plannig to buy wedge ports heads, my engine is 2110 82 x 90.5 with cb fuel injection 125 cam nos 05080 system
I like the idea to stay with 90.5 size, I never like the opened size of the 94 at the head and the block
questions
1.- how much nitrous can I run with 90.5 pistons ?
2. If I upgrade to 94 is it true that exist 94 cylinder barrels that fits inside the 90.5 ,92 size bored already in my block ?
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Ohio Tom (DdK)
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« Reply #2 on: March 09, 2011, 04:07:32 pm » |
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I see that you don't have many responses here so I'll try to help what I can.
1. I think you can get away about 50hp-75hp shot. If you go more, you really should be using a forged piston.
The only experience I can draw on is turbo applications. We can typically go 15-18psi of boost before a forged piston is really required. That equates to about 100hp increase over normally aspirated configuration.
1.5. you may not get much response on this topic. Not too many folks run N2O on VW motors. Everyone I have ever seen do it ends up with a broken stuff pretty quick. There are plenty of experts who get away with it, but I don't recomend doing it unless you really know what you are doing.
You cannot let the motor go Lean NOT ONE TIME. Or it will go bang.
2. Yes, You can purchase 94 barrels that are cut down at the base to fit a 90.5mm case. It works fine. You will still have to bore the heads out larger.
2.5. If you are serious about running N2O, then I really would hesitate to run 94 cylinders. They will crack very easily if things are not perfect. 90.5 cyl is much thicker and will tolerate some abuse before letting go.
So, let's say you run N2O with 94's. If you have a "issue" with fuel dellivery, you will take out your rod bearings, melt pistons AND crack the cyls.
If you run 90.5's you will just take out the rod bearings and melt pistons.
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Ohio Tom Simpson. Home of the Killa' Bee.
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eduardocastrejon
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« Reply #3 on: March 09, 2011, 06:43:38 pm » |
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Thanks a lot for your answer
ok, I will bought heads for 90.5 I will stay with 90.5
questions
1.- exists 90.5 forged pistons because I only found 94 ?
2.- my nitrous kit came with some jets and says that 18/22 wil gave me 60 to 90 hp, is the smaller size ,that I pretend to start , but reading other posts says that when running fuel injection then the jets need to be square is that true ?
3.- what about running 20/22 nitrous -fuel , still is reach
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1836vw
Newbie
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« Reply #4 on: March 09, 2011, 10:09:22 pm » |
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What RPMs are you going to inject the nitrous? Is the nitrous going to be added as a gas or a liquid?
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S/P4884
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« Reply #5 on: March 09, 2011, 11:59:48 pm » |
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Have you tried www.ultimateaircooled.com? They have a section that talks about nitrous motors. You might get a better feed back on that site. |
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Precision Engineered Performance
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eduardocastrejon
Junior
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Posts: 189
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« Reply #6 on: March 10, 2011, 03:33:13 am » |
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medical gas
2500 to 6000 rpm
mallory 685 hyfire control box, to control nitrous and timing retard
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Squirmn German
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« Reply #7 on: March 10, 2011, 03:44:40 pm » |
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Put a turbo on it and throw that nitrous in the trash. =)
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