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one simple question on type s piston

 
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Old 12-02-2011, 03:52 PM
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one simple question on type s piston

ok. im getting frustrated with this. lots of research and no direct answer. i have an h22a4 that im rebuilding. can i get type S pistons .25 OS and do a straight swap? no changes to the rods, valves, or anything like that? everything else will remain stock. someone who knows their engines please answer
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Old 12-02-2011, 05:27 PM
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Re: one simple question on type s piston

I dont think it should affect your head, but ill let someone else with more knowledge Verify
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Old 12-02-2011, 07:08 PM
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Re: one simple question on type s piston

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Originally Posted by Lazarky View Post
I dont think it should affect your head, but ill let someone else with more knowledge Verify
thank you good sir, anyone else? buummppppp
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Old 12-02-2011, 08:06 PM
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Re: one simple question on type s piston

no, you don't have to do anything. IIRC the only difference is where the pin is located on this piston as opposed to a standard 10:1 cr stock piston
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Old 12-02-2011, 11:58 PM
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Re: one simple question on type s piston

It is a straight swap, although if you are getting the .25 OS you'll have to hone your block out a little to make them fit properly. The OS stands for oversized. They sell standard sized Type S pistons as well.
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Old 12-03-2011, 01:03 AM
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Re: one simple question on type s piston

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Originally Posted by UPSluder View Post
no, you don't have to do anything. IIRC the only difference is where the pin is located on this piston as opposed to a standard 10:1 cr stock piston
thanks soo much! and this wont cause piston-valve contact right?

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Originally Posted by 1BadBB6 View Post
It is a straight swap, although if you are getting the .25 OS you'll have to hone your block out a little to make them fit properly. The OS stands for oversized. They sell standard sized Type S pistons as well.
yea i am getting my block bored to fit the pistons. thanks so much!! so the piston wont be kissing my valves or anything like that right on the oem rods right? and the valves can handle the extra compression?
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Old 12-03-2011, 12:37 PM
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Re: one simple question on type s piston

after the block is honed and everything is installed, you shouldnt have a problem as long as the timing is set correctly.

the type s pistons and cams are only slightly different than the ones in the usdm motors. Everything is OEM and will work together.
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Old 12-03-2011, 12:40 PM
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Re: one simple question on type s piston

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Originally Posted by flyerfolife View Post
thanks soo much! and this wont cause piston-valve contact right?
No I am running type s pistons right now

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Originally Posted by flyerfolife View Post
yea i am getting my block bored to fit the pistons. thanks so much!! so the piston wont be kissing my valves or anything like that right on the oem rods right? and the valves can handle the extra compression?
Yes the valves can handle it, and I have oem rods. I would not bore your cylinders, the frm sleeves are not very thick.
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Old 12-03-2011, 12:48 PM
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Re: one simple question on type s piston

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Originally Posted by keeganhmorgan View Post
Yes the valves can handle it, and I have oem rods. I would not bore your cylinders, the frm sleeves are not very thick.
the correct term is hone, and the oversized version of the type s pistons won't fit w/o doing this.
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Old 12-03-2011, 01:16 PM
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Re: one simple question on type s piston

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Originally Posted by ogsmakdade View Post
the correct term is hone, and the oversized version of the type s pistons won't fit w/o doing this.
so when i send the block in i am sending a piston in with it, and the shop said they would measure the piston and bore the block accordingly. so i tell them to just hone out my block? i thought hone was just giving a fresh surface to the walls
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Old 12-03-2011, 01:20 PM
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Re: one simple question on type s piston

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Originally Posted by flyerfolife View Post
so when i send the block in i am sending a piston in with it, and the shop said they would measure the piston and bore the block accordingly. so i tell them to just hone out my block? i thought hone was just giving a fresh surface to the walls
this is all getting redundant. just send the stuff to them and let them do their job.
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Old 12-03-2011, 02:35 PM
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Re: one simple question on type s piston

boring is substantially increasing the size of the inside diameter of the piston walls to accept OS pistons. honing is just finishing up the surface to accept new piston rings. in your case, going with oversize pistons, you will need to bore AND hone the cylinder walls.
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Old 12-03-2011, 08:26 PM
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Re: one simple question on type s piston

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Originally Posted by ogsmakdade View Post
this is all getting redundant. just send the stuff to them and let them do their job.
yes sir! thanks so much all of your answers
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Old 12-03-2011, 09:53 PM
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Re: one simple question on type s piston

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Originally Posted by flyerfolife View Post
yes sir! thanks so much all of your answers
no problem man. I'm not always 100% correct, but I'll try to help the best I can. Big props to ups, 1bad, keegan, and natt for sharing their insight, all good info.
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