Stroker building in Venezuela - Final two options

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Re: Stroker building in Venezuela - Final two options

Post by jeepxj3 »

Stock pins are 0.931" if that helps.
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Re: Stroker building in Venezuela - Final two options

Post by lcolina »

jeepxj3 wrote:Stock pins are 0.931" if that helps.
Definitely Helps. There is a difference of 0.931-0.927= 0.004". Thanks.

What do you guys recommend?

Can a Machinist make bushings for that
Should I use stock pins with my forged pistons?
Should I contact bulltear and order a new set of pins?
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Re: Stroker building in Venezuela - Final two options

Post by optmaxx »

My pistons have the 691 casting from a '96 4.0, and were pressed in according to my machinist. I tried to see if they would slide out from the rods by hand and they don't, they seem to be in there pretty good; I ordered from Bultear also. I also wonder if your rod casting has anything to do with it? I might call my machinist later to see if he had any issues when pressing in the pins, but I'm sure that he would have told me if the pins were going in by hand.
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Re: Stroker building in Venezuela - Final two options

Post by lcolina »

optmaxx wrote:My pistons have the 691 casting from a '96 4.0, and were pressed in according to my machinist. I tried to see if they would slide out from the rods by hand and they don't, they seem to be in there pretty good; I ordered from Bultear also. I also wonder if your rod casting has anything to do with it? I might call my machinist later to see if he had any issues when pressing in the pins, but I'm sure that he would have told me if the pins were going in by hand.
Hi optmaxx, thanks for replying and helping.

The specs printed in my order says the pin diameter is 0.927". Is it possible for you to check what diameter is printed in your specs page for the wrist pin? Thanks.
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Re: Stroker building in Venezuela - Final two options

Post by lcolina »

Right now I have been recommended 3 options:



1- Request to the machinist to make some bushings. 0.004" seems imposible to make.
2- Order a new set of wire locks and use them. SilveXJ said it is not recommended to use float setup with non-floating rods.
3- Buy locally stock 4.0 pin.

What option do you guys think is the best for this stroker?
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Re: Stroker building in Venezuela - Final two options

Post by Russ Pottenger »

Your solution is very simple.
Your piston was made for a .927 Chevy wrist pin.
Bush your rods using a AB (aluminum/bronze) bushing. With that bushing you want to run .0008 to .001 clearance. Order
the proper clips.
As mentioned earlier, Do Not Float in steel.

For the longest time I was buying solid barstock and making my own bushings.
About 10 years ago I found out the Scat had .912, 9.27, and .990 blanks in their catalog cheaper
than I was able to buy the material and still have to make them. These bushings have a .974 OD.
I use them on my 4.0 stock rods with my custom stroker pistons utilizing Chevy .927 diameter pins.

Hope this helps,
Russ
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Re: Stroker building in Venezuela - Final two options

Post by jeepxj3 »

If you enlarge the stock small hole to 0.974" and 'bushing' them for the smaller chevy 0.927" pin, do you have to drill an oil hole in the rod to get oil to the pin/bushing?

Could you ?hone the same bushing to 0.932", and could you use the stock pin and proper clips and 'convert' the stock rods and pins to floating?
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Re: Stroker building in Venezuela - Final two options

Post by Russ Pottenger »

jeepxj3 wrote:If you enlarge the stock small hole to 0.974" and 'bushing' them for the smaller chevy 0.927" pin, do you have to drill an oil hole in the rod to get oil to the pin/bushing?

Could you ?hone the same bushing to 0.932", and could you use the stock pin and proper clips and 'convert' the stock rods and pins to floating?

You need to drill the top of the rod so the bushing gets oil.


No good reason I can think of to bush a rod to a stock jeep pin diameter.
Part of the reason and benefits of bushing the small end of the rod is correcting the center to center
and you need enough bushing wall diameter to allow the variances in rod lengths.
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Re: Stroker building in Venezuela - Final two options

Post by lcolina »

Russ Pottenger wrote:

You need to drill the top of the rod so the bushing gets oil.


No good reason I can think of to bush a rod to a stock jeep pin diameter.
Part of the reason and benefits of bushing the small end of the rod is correcting the center to center
and you need enough bushing wall diameter to allow the variances in rod lengths.
Russ, there is one issue according to the machisit, not enough wall in the rod as you mentioned. I just came from the machinist to make your suggestion.

Racetec suggested to use stock pins in the rods and to open up slightly the piston to allow 0.008 to .001 larger than the pin diameter .

What I don't understand is why the made the pistons to use 0.927" pin knowing that I was going to use 242 rods (.931").

I asked the machinist to measure everything (piston hole, pin, and rod) to know exactly all measures. Hopefully tomorrow will have an answer.

Thanks,
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Re: Stroker building in Venezuela - Final two options

Post by SilverXJ »

lcolina wrote: I asked the machinist to measure everything (piston hole, pin, and rod) to know exactly all measures. Hopefully tomorrow will have an answer.
Good plan. We will have a baseline to see where the discrepancy is.
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Re: Stroker building in Venezuela - Final two options

Post by jeepxj3 »

Is there any advantage to floating pins vs. pressed?
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Re: Stroker building in Venezuela - Final two options

Post by Russ Pottenger »

I guess I'm not understanding the question.

If your machinist is saying you don't have enough wall in your Rod to allow a bushing he is simply wrong.

If you talk to Randy at RaceTec, I'm sure he was under the assumption you are bushing the rod.
Otherwise he would have built you a piston/pin combination allowing you to go the press pin route
utilizing the stock .931 pin.

Last question. Why would you have a custom piston made for the short 242 rod?

BTW, I've done the stock 4.0 with 927 pins with no problems whatsoever.

Russ
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Re: Stroker building in Venezuela - Final two options

Post by optmaxx »

lcolina wrote:
optmaxx wrote:My pistons have the 691 casting from a '96 4.0, and were pressed in according to my machinist. I tried to see if they would slide out from the rods by hand and they don't, they seem to be in there pretty good; I ordered from Bultear also. I also wonder if your rod casting has anything to do with it? I might call my machinist later to see if he had any issues when pressing in the pins, but I'm sure that he would have told me if the pins were going in by hand.
Hi optmaxx, thanks for replying and helping.

The specs printed in my order says the pin diameter is 0.927". Is it possible for you to check what diameter is printed in your specs page for the wrist pin? Thanks.
Yeah, mine says .927 also. I talked to my machinist and asked if he had any issues when installing the pin and he said no. He said that he used heat and installed them by hand, but once they cooled they locked themselves into place. I tried moving mine by hand again to make sure, but they don't move no matter how hard I try. I hope you find a solution lcolina.
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Re: Stroker building in Venezuela - Final two options

Post by optmaxx »

Russ Pottenger wrote:I guess I'm not understanding the question.

If your machinist is saying you don't have enough wall in your Rod to allow a bushing he is simply wrong.

If you talk to Randy at RaceTec, I'm sure he was under the assumption you are bushing the rod.
Otherwise he would have built you a piston/pin combination allowing you to go the press pin route
utilizing the stock .931 pin.

Last question. Why would you have a custom piston made for the short 242 rod?

BTW, I've done the stock 4.0 with 927 pins with no problems whatsoever.

Russ
He asked in one of his posts if his rods were from a 242 or not judging from the casting numbers on his rods. I have 4.0 with the casting 691 and the pins seem to be in the rods pretty tight with no play. Could his rods be the issue?
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Re: Stroker building in Venezuela - Final two options

Post by Russ Pottenger »

You would have no way of judging if the interference fot is correct once the piston is installed on the rod.
I shoot for at least -.001
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