piston pin too large for stock rods.
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
piston pin too large for stock rods.
well I was putting the motor together and got to when I was putting the pistons on the rods and this is what I found. im using auto tec pistons, 4.010 since im bored .10 over. the pins that came with auto tec are .097, the size of the small end on the factory rods are .095. can the bushings be honed .002?
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
good deal, the machine shop that did the rest of the work ordered the pistons for my build and it came with the .097 pins, not sure if I could get the same pistons with the .095 pin or not but I guess if they do hone the bushing, this ensures it to be perfectly round. I just want to make everything right and reliable and not second guessing anything. I then of course looked at the K1 rods, stock stroke and all, just a .097 small end size. might go that route also.
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
I would ask why they supplied a .97 pin as opposed to the factory .943
You can hone it to fit, dependent on the thickness of the bushing in the small end.
Myself, I prefer the earlier .927 pin for the weight savings.
I'm sure you balanced the assembly, but the extra weight of the pin is on the wrong end.
I know, people are going to say that the additional weight is nothing, but in the scheme of things, it all adds up. if the weight of the pin was insignificant then all the various pins designed to cut weight would all be for nothing.
You can hone it to fit, dependent on the thickness of the bushing in the small end.
Myself, I prefer the earlier .927 pin for the weight savings.
I'm sure you balanced the assembly, but the extra weight of the pin is on the wrong end.
I know, people are going to say that the additional weight is nothing, but in the scheme of things, it all adds up. if the weight of the pin was insignificant then all the various pins designed to cut weight would all be for nothing.
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
the machine shop had the crank and block, the only thing they did was bore the block .010 over/hone and prep it. they checked the crank out and installed a double roller timing chain gear and polished the crank up a little bit. I got the pistons and was just gonna start putting it back together.
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
not sure why haha, im gonna contact them tomorrow and either see if they can get the same piston kit made with the stock size pin, or if I have to buy new rods, OR if they feel honing the small end will be ok I guess.
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Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
how about put the wrist pins in the freezer the colder the better! then boil a big pot of water/oil, put the retainer in one side of the piston put the piston in the hot water/oil leave it for a few mins have another set of hands with gloves take pin/piston out quickly insert pin in one motion don't stop! wa-la put retainer in, don't turn them down!
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
http://www.summitracing.com/parts/ko...et?prefilter=1
I think im gonna order these tomorrow, these do have the same specs as far as the big end size correct? I already have new bears for my stock rods/crank or maybe the new rods will come with bearings? anyone know?
I think im gonna order these tomorrow, these do have the same specs as far as the big end size correct? I already have new bears for my stock rods/crank or maybe the new rods will come with bearings? anyone know?
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
talked to auto tec today, they said the pin that was supplied (.945) can either be pressed in, or have the bronze bushing machined out and made into a floating pin. of course the floating pin is factory but what do yous think? have the shop press them in? or get them machined and stick with floating?
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
http://www.summitracing.com/parts/ko...et?prefilter=1
I think im gonna order these tomorrow, these do have the same specs as far as the big end size correct? I already have new bears for my stock rods/crank or maybe the new rods will come with bearings? anyone know?
I think im gonna order these tomorrow, these do have the same specs as far as the big end size correct? I already have new bears for my stock rods/crank or maybe the new rods will come with bearings? anyone know?
I would use a 6.125 rod length if you replace the rods.
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
I want to use the .945 size wrist pin, but use free float.
would I be ok to use these instead?http://www.summitracing.com/parts/es...make/chevrolet
these rods have a 6.100 stroke though? would that be ok to run with my trick flow set up? the pistons I have are these also http://www.racetecpistons.com/at_products/index.htm
piston kit # 1000591
would I be ok to use these instead?http://www.summitracing.com/parts/es...make/chevrolet
these rods have a 6.100 stroke though? would that be ok to run with my trick flow set up? the pistons I have are these also http://www.racetecpistons.com/at_products/index.htm
piston kit # 1000591
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
I want to use the .945 size wrist pin, but use free float.
would I be ok to use these instead?http://www.summitracing.com/parts/es...make/chevrolet
these rods have a 6.100 stroke though? would that be ok to run with my trick flow set up? the pistons I have are these also http://www.racetecpistons.com/at_products/index.htm
piston kit # 1000591
would I be ok to use these instead?http://www.summitracing.com/parts/es...make/chevrolet
these rods have a 6.100 stroke though? would that be ok to run with my trick flow set up? the pistons I have are these also http://www.racetecpistons.com/at_products/index.htm
piston kit # 1000591
The footnotes say D,L but I couldn't find the definitions.