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Tractor Pulling Discussion Forum

4020 pistons in 88

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minnieub

10-19-2003 16:27:16

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heard you could use 4020 pistons ina 88 what bore is 4020's andwhat rods can you use. also what stroke can you put in a 88 with out alot of grinding. what kind of horses are you getting withthis 4020 combo. thanks dave

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Jerry B

10-20-2003 06:11:55

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Re: 4020 pistons in 88 in reply to minnieub, 10-19-2003 16:27:16

4020 JD sleeves are 4.250 bore. The block has to be bored and the sleeves will need to be cut off at the bottom and have sealing ring grooves turned in them. The OD of the sleeves might have to be reduced a little for clearance.

The longest stroke you can get in an 88 without a lot of grinding is about 4.750. If you are willing to grind (a lot) you can go 6 inches easy.

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minie ub

10-20-2003 18:17:59

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Re: Re: 4020 pistons in 88 in reply to Jerry B, 10-20-2003 06:11:55

thanks for info does anyone have the 4.25 bore and 4.75 stroke that would tell me what rods they used. thanks

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Jerry B

10-21-2003 06:08:44

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Re: Re: Re: 4020 pistons in 88 in reply to minie ub, 10-20-2003 18:17:59

There are always compromises to be made when trying to use stock parts to build a stroker. Cody said his 88 had a piston/deck clearance of .150. The only way to solve taht problem is a set of custom rods that are .150 longer than stock 88's or custom pistons with a compression height that is .150 longer than the stock JD piston.

If you dig deep enough and research long enough you might find a rod that would be near the correct length. However the journal might be the wrong size and require the crank to be reworked. The wrist pin might be too big or too small and require machine shop alteration in order to use it.

The simplest way is to decide what rod you wish to run then have a set of custom pistons built to your specs. OR you could also decide what piston you wish to run and have a set of custom rods built. Pistons cost less that rods. Been there, done that, got the deflated bank account to prove it.

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Brad

10-21-2003 10:04:49

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Re: Re: Re: Re: 4020 pistons in 88 in reply to Jerry B, 10-21-2003 06:08:44

selecting the right rod can make a bunch of power. you want rod that is right about 1.75 the lenght of the stroke you want to run. the stock rods are not the best answer for a big stroke motor, but they do work. another important factor is the rpm that you want to run. If you are talking about running a 4.5 stroke, I would run a 251 chrysler rod. this makes a perfect 1.75 rod ratio. this will also take a custom piston with a .960 compression height.

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Cody

10-20-2003 19:02:09

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Re: Re: Re: 4020 pistons in 88 in reply to minie ub, 10-20-2003 18:17:59

I had an 88 that was 4.25 x 4.5. It had 4020 pistons in it with a 99 crank that was offset ground .500. We used the 88 rods back. The pistons lacked about .150 coming all the way to the top, but it was a fairly inexpensive motor.

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