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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Super 88 - Hey Brad

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Lynn

04-09-2004 22:18:45




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What all do you do to these 88 diesel heads that you have built? I had the head sonic tested around the valves and there just is not to much meat to take off to lower the compression. Do you even worry about the compression, what kind of valves do you use? The compression has to be around 26 to 1. I am thinking about sinking the original valves into the original valve seats to get rid of some compression but am worried about loosing air flow. I know you said that you wouldnt get a thicker head gasket, but that would be a way to lower the comprssion also. Just looking for pointers, I have the short block completed and now need a head to bolt to it.
Also, do you have an original tachometer for a super 88 that you would want to sell? I need the tachometer, mount, and cable. Thanks, Lynn

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Brad

04-12-2004 16:22:55




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 Re: Super 88 - Hey Brad in reply to Lynn, 04-09-2004 22:18:45  
Lynn, Sorry, I haven't been on the computer for a few days. If you are running 4.25x4.5 that comes to 383 cubes. Now these figures are just off of the top of my head, so don't hold me to them but a 880 if I remember right is 265 cid and 15.5:1 that comes to 50 cc's of combustion space. that would put your engine at just about 22:1. they had a smaller bore gasket but they also had a .060 quench area so the bigger gasket and .040 quench comes to about the same cc's. I think that if you go over 20:1 without a girdle you are pushing your luck. most of the diesels I have built are either stock stroke or 3.875 bore so compression is not an issue.You need to gain about 6-7 cc's of combustion space. I'm not sure what the ramp rate is on the camshaft lobe that you have, but cutting a 2.25x .100 valve relief in the piston should get you where you need to be. you may find you need the valve relief anyhow,

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Lynn

04-12-2004 19:06:51




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 Re: Re: Super 88 - Hey Brad in reply to Brad, 04-12-2004 16:22:55  
Two questions, and they may be dumb ones, but, will it hurt reusing these rod bolts that you sent me after torqueing them to 90 ft. lbs? Do I drill this 2.25x.100 hole in the center of the piston or do I center it under the intake valve? I am probably going to drill with a 2-3/8 inch hole saw and go .150 deep, then ream it out. I would rather it be closer to 18 to 1 compression than 20 to 1.



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Bryce

04-14-2004 18:52:31




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 Re: Re: Re: Super 88 - Hey Brad in reply to Lynn, 04-12-2004 19:06:51  
Lynn,I would like to talk to you about the size of your engine.I have a gas engine the same CI as yours,I'm interrested as to how it dyno'd.Not wanting to know all the secrets just curious as to how they stackup as mine is different bore and stroke.Contact me privately if you wish,as to keep everything relativy private.Looking forward to your reply. Thank you, Bryce

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Brad

04-12-2004 19:26:09




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 Re: Re: Re: Super 88 - Hey Brad in reply to Lynn, 04-12-2004 19:06:51  
You can reuse the rod bolts, you want to center the relief under the intake valve.



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Russ

04-12-2004 02:53:01




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 Re: Super 88 - Hey Brad in reply to Lynn, 04-09-2004 22:18:45  
Too much c/r: Sounds like with the tolerances and setup you are running the only way you can drop the c/r is to keep the engine shut off. Maybe your readers can suggest some other practical running fixes. Good luck.



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J. Schwiebert

04-11-2004 05:36:32




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 Re: Super 88 - Hey Brad in reply to Lynn, 04-09-2004 22:18:45  
Are you running the super head with the big or the little exhaust valves. Just curious, are you running a girdle? That seams like a lot of pressure on that crank with out additional support. Have you thought about taking some off the pistons? What bore and stroke are you running?



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Lynn

04-11-2004 14:59:42




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 Re: Re: Super 88 - Hey Brad in reply to J. Schwiebert, 04-11-2004 05:36:32  
I am running with a 190 waukesha crankcase that has studs and dowels for mains and a couterbalanced 195 crankshaft with 2-5/8 rod journals. Brad tells me to leave the pistons flush with the top for cooling purposes and for combustion purposes. He also believes in .040 thick head gaskets and no thicker. He has built many of them so I know his theory works, but I just have some questions on the head. I am running 1/2 inch of stroke and 4-1/4 bore.

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J. Schwiebert

04-10-2004 16:59:30




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 Re: Super 88 - Hey Brad in reply to Lynn, 04-09-2004 22:18:45  
This is an interesting post. Where does this 26:1 compression come in at? I take it a turbo is being added. If you want to lower the compression take a little off the pistons. You do the math. stock is about 15.5:1 How much boost do you want to run?



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RAB

04-11-2004 00:04:52




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 Re: Re: Super 88 - Hey Brad in reply to J. Schwiebert, 04-10-2004 16:59:30  
I would think it is an indirect injection head and no account has been taken for the combustion chamber? Can't tell from the original post whether he wants the c/r to be raised or lowered.
Regards, RAB



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Lynn

04-10-2004 19:20:36




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 Re: Re: Super 88 - Hey Brad in reply to J. Schwiebert, 04-10-2004 16:59:30  
You get that much compression when you have 396 cu. in. and the pistons are flush with the top of the block and the head gasket is .040 thick with a diesel head. I am not running a turbo. And I am running the original head. Will it ever work? I hope, Brad says it will.



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