Thread: 4-53 supercahrger help!!!

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4-53 Jimmy blower is off a 4-cylinder engine with 53 cubes per cylinder, for a total of only 212 cubes. Its going to be marginal, even for your modest requirements , on a 360. You'll have to overdrive it a lot. A 4-71 (4 cyl., 71 cubes per cyl.} would be better, but you already have the '53, so.....
It is possible to mill a standard 4-bbl manifold so the flange is parallel to the crank plane and build a plate to bolt the blower to. I did that with a Chevy/4-71. Use a serpentine belt and (hopefully) it will slip when it backfires and not need a blow-off valve.

i had a 4-71 and a 6-71 blower, i put a 6.71 intake on both motors and then made a plate to bolt to the intake so i could use either blower on either motor by changing the plate. worked out great.

[QUOTE=R Pope]4-53 Jimmy blower is off a 4-cylinder engine with 53 cubes per cylinder, for a total of only 212 cubes. Its going to be marginal, even for your modest requirements , on a 360. You'll have to overdrive it a lot.

When thinking in terms of air volume, remember that the 71 and 53 series Detroit Diesels are two stroke engines and thus the blower must supply enough air for a power stroke every other stroke instead of every fourth stroke. Makes a big difference in volume requirements. That said, I'd look for a 71 series blower, even if it's more money. By the time the 53 series could be made to work on an automotive engine, more money could be spent than with an "off the shelf" 71 blower.

Bob

Well, I have some good news and some bad news. The bad news is, your blower is not suitable for any V8 application. The good news is, you now have a very interesting door stop.

I called BDS and ran it by them. The man said he offers his condolences, but these are just not suitable for anything but a 2 cyl or 4 cyl engine, and not even then. No one does anything with them except B and M and Weiand, and they only use the rotors out of them, not the cases. In addition, no one makes a 360 manifold for this setup.

He said using this blower on a 360 would be "like a pimple on an Elephants a**."

We've all bought stuff that seemed like it was a good deal, but later turned out to be a loser. Hope you didn't pay too much.


Don

[quote=bobscogin]

Originally Posted by R Pope

4-53 Jimmy blower is off a 4-cylinder engine with 53 cubes per cylinder, for a total of only 212 cubes. Its going to be marginal, even for your modest requirements , on a 360. You'll have to overdrive it a lot.

When thinking in terms of air volume, remember that the 71 and 53 series Detroit Diesels are two stroke engines and thus the blower must supply enough air for a power stroke every other stroke instead of every fourth stroke. Makes a big difference in volume requirements. That said, I'd look for a 71 series blower, even if it's more money. By the time the 53 series could be made to work on an automotive engine, more money could be spent than with an "off the shelf" 71 blower.

Bob

When thinking in terms of air volume, remember that the 71 and 53 series Detroit Diesels are two stroke engines and thus the blower must supply enough air for a power stroke every other stroke instead of every fourth stroke. Makes a big difference in volume requirements.
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you lost me there bob. if you put a blower on a 212 cu. in. diesel motor and the same blower on a 212 cu.in. gas motor, if the blower is big enough to do the job then 2 stroke or 4 stroke has nothing to do with it. what am i missing?

Yeah, I ran that arguement by the guy at BDS, and he said that thinking is backwards. I didn't fully get all he was saying, but he was telling me the 2 cycle had less of an airflow requirement because of the every stroke thing. He said to equate a 212 CI 2 stroke to a 424 CI 4 stroke is backwards.

It's over my head, but he is the expert.


Don

Originally Posted by Itoldyouso

Yeah, I ran that arguement by the guy at BDS, and he said that thinking is backwards. I didn't fully get all he was saying, but he was telling me the 2 cycle had less of an airflow requirement because of the every stroke thing. He said to equate a 212 CI 2 stroke to a 424 CI 4 stroke is backwards.

It's over my head, but he is the expert.


Don

might be true if you're working with 15 lbs. of boost, but with 7 lbs. i dont think it makes no dif. thats all i ever run anyway.

[QUOTE=Itoldyouso]Yeah,
It's over my head, but he is the expert.

Well, maybe you can't make a direct comparison, but if not I don't understand why. If a four stroke engine of given displacement draws charges every 720 degrees (1 stroke out of four) and the same displacement two stroke engine draws a charge every 360 degrees of rotation (1 stroke out of two), won't the two stroke be pumping twice the volume of air in a given time period?? Somebody needs to convince me otherwise. ;-)

Bob

[QUOTE=Itoldyouso]Yeah,
It's over my head, but he is the expert.

Well, maybe you can't make a direct comparison, but if not I don't understand why. If a four stroke engine of given displacement draws an intake charge every 720 degrees (1 stroke out of four) and the same displacement two stroke engine draws a charge every 360 degrees of rotation (1 stroke out of two), won't the two stroke be pumping twice the volume of air in a given time period?? An engine's nothing but an air pump. What am I missing??

Bob

if i'm getting my 7 lbs. of boost that i need, i dont see that it makes no dif. what it came off of. if the blower is to small then it would make a dif.

A few years back I remember reading an article about a rod shop modifying the 4-53 blower for use on Ford flathead V8s. You might try a search on one of the "traditional" rod forums along this path.

You could take a look at the small B&M blowers to see if there's a chance they were based on the GMC 53 series and if the snout could be adapted. I've never been up close to a B&M, so it's just a swag.

You also should check to see if high speed sealed bearings are available for that blower. The stock blower was not intended to produce boost, just scavenge the cylinder during the exhaust cycle and refil to normal atmospheric pressure.

Cheers, Mark

>The stock blower was not intended to produce boost, just >scavenge the cylinder during the exhaust cycle and refil to >normal atmospheric pressure.

True, and a good point.

Bob