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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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GMC 4-53

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Jerry B

04-27-2004 05:29:14




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I was talking with a very nice gentleman the other day and he was telling me about over-driving the blowers on the GMC 3-71 and 4-43 engines in order to up the boost pressure to allow running larger injectors.

I have looked at my manual and found nothing that would indicate being able to place a smaller blower drive gear against the cam gear in order to run the blower faster.

How is this done? Is there a "kit" availible for such a change?

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Russ

04-27-2004 16:29:00




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 Re: GMC 4-53 in reply to Jerry B, 04-27-2004 05:29:14  
Engines Blown? Just dreamin', could a clever person inject nitrous oxide into a 22:1 diesel engine with good results? As long as the tractor engine could withstand the beating it might chalk up some pullin' wins. Just dreamin'.



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The Swami

04-27-2004 11:22:07




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 Re: GMC 4-53 in reply to Jerry B, 04-27-2004 05:29:14  
Someone has fed you a line of BS sir. If you wanted to overdrive a blower, you would have to get custom gears built, there is no stock Detroit part that is going to accomplish this, and if you did do it, you are not going to gain anything. A detroit non turboed is a naturally aspirated engine, the blower does NOT build boost! All the blower does is push the exhaust out when the valves open. What you have been told is just another tractor pulling myth that isn't true. It is usually a story started by someone that has never been around Detroits, and most likely got beat by one. You can still put the larger injectors in though, and it will work, turn your rpms up though. Good luck!!

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Someone that has seen a D

04-27-2004 18:14:05




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 Re: Re: GMC 4-53 in reply to The Swami, 04-27-2004 11:22:07  
I agree with "the Swami". Many folks call it a blower, but it is really a scavenger. It pushes out the spent air and "loads" the fresh air. In a 4 stroke, positive air pressure at the intake boosts power, but this is a two stroke. Overloading it just pushes more air out the exhaust. Any more air, or "boost", going through the combustion chamber may slightly improve performance, but only because it may be doing a better job of "scavenging". Not the same kind of improved performance that adding a blower to a four stroke would, or can add.

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don

04-27-2004 18:09:31




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 Re: Re: GMC 4-53 in reply to The Swami, 04-27-2004 11:22:07  
oliver is it, apparently you and a couple others know what a 3-71 and 4-53 is (two cycle supercharged diesels)It's been a long time since I've been around those bad boys if I remember corectly a couple things just questions, aren't those engines ported intake and valved exhaust? if so why can't you modify the port openings ever so slightly to allow more air in and polish the intake to reduce friction? Based on the theory of A=pi x r square a little is a bunch should increase air flow immensely then find a way to upsize the exhaust valves one size,then mess with the nozzle sizes, just a thought and I agree those little buggers can crank out some hp just give them a little distance to wind up and they are unstoppable. Maybe I'm all wet just a thought.

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Brad

04-27-2004 20:04:55




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 Re: Re: Re: GMC 4-53 in reply to don, 04-27-2004 18:09:31  
I would think that changing the length of the intake ports would be the same as regringing the intake lobes on a 4 stroke. Good idea, but how much? If overdriving the blower dosen't help, why do the turboed engines make more power?



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IanC

04-27-2004 13:16:36




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 Re: Re: GMC 4-53 in reply to The Swami, 04-27-2004 11:22:07  
Your answer is PARTIALLY correct. What the gentleman was talking about was the procedure in AUTOMOTIVE (street rod, dragsters, etc.) of driving a GM blower at ratios of gteater than 1:1. This will build boost pressue in gasoline engines.



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A.P.

04-27-2004 13:53:56




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 Re: Re: Re: GMC 4-53 in reply to IanC, 04-27-2004 13:16:36  
It will also build boost in a Detroit. The gears will probably have to be custom or convert to a belt drive (not v-belt) and/or a bigger blower.

A.P.



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oliver is it

04-27-2004 16:11:20




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 Re: Re: Re: Re: GMC 4-53 in reply to A.P., 04-27-2004 13:53:56  
well ive read all these post and some body is lost somewhere. be cause a friend of mine changed gears and i saw it for my self and they came right out of a detroit box. yes it does push exsaust out and there is other things you have to do to make it work go figure cuss im not tellin this one. doesnt gettin rid of exsaust pull new air in and what make hp. fuel and air have seen him beat every one around and have seen tractor on dino 3-71 185 plus just puttin in bigger injectors a waste of time in less you want to blow smoke and pollute the air mine is stock and i just love beatin them smoke blowers

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The Swami

04-27-2004 19:57:01




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 Re: Re: Re: Re: Re: GMC 4-53 in reply to oliver is it, 04-27-2004 16:11:20  
Overdrive the blower all you want, it does not build any boost unless you could change the cam drastically, cut different sleeve openings etc etc.. The only way to build boost in the detroit is to turbocharge them, and even at that you are limited on flow amount due to the blower restricting it. Thats why the detroits in the Ntpa pulling semis are going to a "blowerless" system, just turbos. And bigger injectors do more than just make smoke, as long as the rpms are up there, at lower rated rpms, yeah, there would be to much smoke. Thats why you gotta let her run!!

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A.P.

04-28-2004 06:52:15




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 Re: Re: Re: Re: Re: Re: GMC 4-53 in reply to The Swami, 04-27-2004 19:57:01  
Its nice to know that the pullers running these machines are doing the impossible

A.P.



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