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Old 03-03-2011, 08:48 AM   #1 (permalink)
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Default Press-Pin Pistons on Floating-Pin Rods?

Can press-pin pistons be converted to be used on floating-pin rods?
About how much could I expect to pay for this?

Thanks.
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Old 03-03-2011, 02:49 PM   #2 (permalink)
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my questions is why?

pretty sure the pistons would need machine work done to it to accommodate a floating wrist pin, don't think you can go the other way
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Old 03-03-2011, 02:56 PM   #3 (permalink)
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i thikn it would be best to machine the piston to accept the floating wrist pin/c clip

or you can re-bush the small end of the rod..
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Old 03-03-2011, 03:03 PM   #4 (permalink)
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ive seen it before but idk how they did it, the pistons had spiral clips on each end im sure a machine shop would have to do the work
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Old 03-03-2011, 03:35 PM   #5 (permalink)
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Originally Posted by qweakers View Post
my questions is why?

pretty sure the pistons would need machine work done to it to accommodate a floating wrist pin, don't think you can go the other way
New 4G63 Pistons (Press Pin) = $100, max.
New, forged H22 Pistons (Floating Pin) = $450+.
New, forged h22 Rods (Floating Pin) = $225+.

It's potentially way, way cheaper to put 4G63 pistons (which will hold almost 500hp) on H22 rods than it is to buy pistons for a H/F.

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i thikn it would be best to machine the piston to accept the floating wrist pin/c clip

or you can re-bush the small end of the rod..
Which would be cheaper?
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Old 03-03-2011, 04:23 PM   #6 (permalink)
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call the machine shop and ask dude
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Old 03-04-2011, 03:26 AM   #7 (permalink)
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my question is why would you want to put dsm pistons in a h/f motor?
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Originally Posted by 12ozwrecker View Post
can you tell me how to hook up a vtech switch?
i want it on the new steering wheel i got at pep boys. have you seen it its sick!
but if i hook up the vtech i can have it at like whatever rpms i want right?
like vtech all the time? will it pop louder?
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Just hook it up to a clapper and slap yourself in the face everytime you race......
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Old 03-04-2011, 04:25 AM   #8 (permalink)
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Originally Posted by siregcivic View Post
my question is why would you want to put dsm pistons in a h/f motor?
Why would someone want to put Vitara pistons in a D motor?
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Old 03-04-2011, 04:49 AM   #9 (permalink)
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Originally Posted by siregcivic View Post
my question is why would you want to put dsm pistons in a h/f motor?
......

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Originally Posted by sxysweed View Post
New 4G63 Pistons (Press Pin) = $100, max.
New, forged H22 Pistons (Floating Pin) = $450+.
New, forged h22 Rods (Floating Pin) = $225+.

It's potentially way, way cheaper to put 4G63 pistons (which will hold almost 500hp) on H22 rods than it is to buy pistons for a H/F.
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Old 03-04-2011, 05:13 AM   #10 (permalink)
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You can do any of 3 things.

1) You can re-bush the rods to make them press fit.
2) You can machine cir-clip groves in the pistons. It is a difficult job and prices might vary greatly depending on how well set up a shop is to do it. They need a way to hold the piston firmly and accurately in place.
3) You can machine buttons from aluminium or a special high temperature nylon. The buttons fit in the ends of the pins and take up the slack between the pin and the bore at each end.
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Old 03-04-2011, 05:33 AM   #11 (permalink)
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Quote:
Originally Posted by patprimmer View Post
You can do any of 3 things.

1) You can re-bush the rods to make them press fit.
2) You can machine cir-clip groves in the pistons. It is a difficult job and prices might vary greatly depending on how well set up a shop is to do it. They need a way to hold the piston firmly and accurately in place.
3) You can machine buttons from aluminium or a special high temperature nylon. The buttons fit in the ends of the pins and take up the slack between the pin and the bore at each end.
Which is generally safer/more reliable?

I googled it yesterday and all of those came up as possible solutions, but someone on some forum mentioned that if you re-bush the rod to make it press fit, that when you press the piston/pin/rod together, the bushing would come out of the rod?
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Old 03-04-2011, 05:47 AM   #12 (permalink)
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They won't come out if they are done right.

Circlip groves should be best if there is enough metal in the pin boss, however that may or may not e so as the pistons where designed for press fit pins, so the bosses might be a bit narrow.

Personally I would use the nylon buttons, but I am in a special position of having a good supply of the "right" nylon and experience at machining it, which is a specialist job. Finding a machinist who really knows how to work with plastic is an issue.
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Old 03-04-2011, 09:33 AM   #13 (permalink)
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Why would someone want to put Vitara pistons in a D motor?
i never heard of anyone putting 4g63 pistons in an h22 before thats why i was asking... how do dsm pistons go with frm sleeves? thats the question
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Originally Posted by 12ozwrecker View Post
can you tell me how to hook up a vtech switch?
i want it on the new steering wheel i got at pep boys. have you seen it its sick!
but if i hook up the vtech i can have it at like whatever rpms i want right?
like vtech all the time? will it pop louder?
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Just hook it up to a clapper and slap yourself in the face everytime you race......
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Old 03-04-2011, 12:31 PM   #14 (permalink)
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i never heard of anyone putting 4g63 pistons in an h22 before thats why i was asking... how do dsm pistons go with frm sleeves? thats the question
F22 Sleeves = Iron, iirc.
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Old 03-04-2011, 12:55 PM   #15 (permalink)
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I thought I read somewhere that H22 ran directly in a Nikasil treated aluminium bore.
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Old 03-04-2011, 01:06 PM   #16 (permalink)
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Quote:
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my question is why would you want to put dsm pistons in a h/f motor?
Quote:
Originally Posted by DILYSI Dave View Post
Why would someone want to put Vitara pistons in a D motor?
Haha!!!

I was asking myself the same question the other day...thinking of putting YCP pg6 or pm3 slug on eagle rod....
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Old 03-04-2011, 01:09 PM   #17 (permalink)
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Easiest and most reliable way, re-bush the rod and press a pin in it. done.

H22= FRM sleeves
f22= Iron sleeves.

And i hate to be the bearer of bad news but this is the first for me to hear about nylon used as buttons, ive heard of steel and alluminum buttons ,but nylon is a first for me.
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Old 03-04-2011, 01:16 PM   #18 (permalink)
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Best way is to machine the pistons for a c-clip groove.

If rules allow for forged pistons that would be the best way to go.
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Old 03-04-2011, 01:28 PM   #19 (permalink)
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I ran nylon buttons for years on some engines including my circut race flat bottom boat, a speedway Midget with an air cooled VW engine, the Channel nine Camero and a bunch of off road engines. This was back before pistons where regularly machined for spiralocks.
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Old 03-04-2011, 01:35 PM   #20 (permalink)
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I ran nylon buttons for years on some engines including my circut race flat bottom boat, a speedway Midget with an air cooled VW engine, the Channel nine Camero and a bunch of off road engines. This was back before pistons where regularly machined for spiralocks.
how did they hold up to the heat?
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