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Old 06-10-2013, 08:26 PM
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Does nitrous stretch rods?

I've heard from a guy that works at UTI that nitrous stretches rods. Does nitrous really stretch rods? I had planed on installing a kit on my 1967 Chevy 327. Thank you and have a nice day.
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Old 06-10-2013, 09:24 PM
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Why do you care? Are you running tight p2v clearance?
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Old 06-10-2013, 09:50 PM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
Why do you care? Are you running tight p2v clearance?
I don't know what that is but I'm pretty sure I'm not
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Old 06-10-2013, 09:53 PM
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Originally Posted by 0trbo4myCHEVUICK View Post
Why do you care? Are you running tight p2v clearance?
It come to me that it meant piston to valve clearance and no I'm not I do have flat top pistons if that matters?
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Old 06-10-2013, 10:02 PM
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Stock rod bolts and nitrous is a grenade with the pin pulled.That's true.
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Old 06-10-2013, 10:14 PM
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Stock rod bolts and nitrous is a grenade with the pin pulled.That's true.
I think I'll stick to a turbo or super charger
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Old 06-11-2013, 04:47 AM
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Actually a turbo properly tuned is the easiest on a engine power adder.

Still any engine with a power adder should be using ARP rod bolts as the insurance marker.

Last edited by 1Gary; 06-11-2013 at 05:02 AM.
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Old 06-11-2013, 06:42 AM
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To answer the original question, "it depends" on what you mean by "stretch". Do the rods become "longer" (c-c)? No. The "big end" of the rod WILL "stretch" where the hole goes "out of round", usually "tight" to 3/9 position, "loose" 6/12. The only time nitrous adds to the load on the rod is during the "power" stroke.

FWIW

Jim
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Old 06-11-2013, 07:24 AM
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In higher horsepower engines, guys use aluminium rods because they kind of act like a shock absorber when running Nitrous.
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Old 06-11-2013, 09:40 AM
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Quote:
Originally Posted by 85chevy10 View Post
I've heard from a guy that works at UTI that nitrous stretches rods. Does nitrous really stretch rods? I had planed on installing a kit on my 1967 Chevy 327. Thank you and have a nice day.
No. Very high RPMs may if you can get there but this is so high 7000-9000 RPM that it takes custom purpose built rods to run here for more than a few moments, be they steel or titanimum for an endurance engine or aluminum for a drag engine on nitromethane.

A nitrous engine does need to be built, especially if looking to exceed 400 horses. That is about the safe limit for a stock SBC bottom end even with pink rods. The worrysome thing is that old engines with high mileage are using up what's called Useful Design Life Cycle which is to say that the constant alternation of operating loads through the engine's useful life span results in fatigue of the molecular structure of the metals. So a high mileage engine regardless of preperation to the original parts may suddenly fail under the added power induced stresses.

Bogie
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Old 06-11-2013, 01:44 PM
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To expand on what Bogie said, there isn't something special about nitrous that causes a specific rod problem. ANY high performance, high RPM engine that builds high cylinder pressures will create internal stresses on the rotating components that need to be dealt with through proper component selection and fitment. Nitrous, turbo, supercharger, or very high compresssion at high RPMs will all eventually lead top the same problems.

On the other hand, if a "guy that works at UTI" said this, what little respect I had for that institution just went in the toilet (unless he works there as a janitor or something...).
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Old 06-11-2013, 07:03 PM
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UTI???? Urinary tract infection???
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Old 06-11-2013, 08:53 PM
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It's a wannabe school.. Way back in high school when all the tech school reps came into the shop at once, the UTI guy was unprofessional, knocked on the other schools for no reason, and when backed into a corner with a question that he knew the answer was bad for the schools image, he just stomped around like a little girl, and those questions came easy as the only thing going for UTI is the accreditation for various auto manufactures to be cert' techs, but even a community collage can train for those
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Old 06-12-2013, 10:37 PM
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UTI, Lincoln Tech, And Wyotech are not schools they are businesses. You go to the them for 9 months to a year pay $40,000. You leave with a piece of paper that says you completed the school, no ASE certifications no degree just a worthless piece of paper with your name on it. I really considered going into the automotive field and honestly kind of glad I didn't. The school I do attend offers a bachelors degree in automotive technology, and i have a few friends in that field. They always complained about this one instructor who is a complete idiot apperently. He had previously worked at UTI. I had signed up for introduction to automatic transmissions just for fun and he was the instructor, but i guess I'm lucky that I don't have to take the class from him now because he was fired and will not be returning in the fall....just my two cents
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Old 06-17-2013, 11:10 PM
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Quote:
Originally Posted by NoShow&AllGo View Post
UTI, Lincoln Tech, And Wyotech are not schools they are businesses. You go to the them for 9 months to a year pay $40,000. You leave with a piece of paper that says you completed the school, no ASE certifications no degree just a worthless piece of paper with your name on it. I really considered going into the automotive field and honestly kind of glad I didn't. The school I do attend offers a bachelors degree in automotive technology, and i have a few friends in that field. They always complained about this one instructor who is a complete idiot apperently. He had previously worked at UTI. I had signed up for introduction to automatic transmissions just for fun and he was the instructor, but i guess I'm lucky that I don't have to take the class from him now because he was fired and will not be returning in the fall....just my two cents
well i want to go to a school that offers hot rod class and just a automotive class.
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