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Re: WHAT ROD LENGTH?
[Re: moparmacka]
#882274
12/17/10 09:10 AM
12/17/10 09:10 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Is that around 1.460 comp height for the pistons?
A friend has a set of 6.250 Chev large journal rods at the right price and I figured I need to get custom pistons anyway......
With a stock deck and the 6.125 Diamond has a 1.459 CH for a 4" crank... my block is decked and mine has a CH 1.383 (I think it is)
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Re: WHAT ROD LENGTH?
[Re: moparmacka]
#882277
12/17/10 05:50 PM
12/17/10 05:50 PM
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Joined: Jan 2003
Posts: 6,137 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,137
Melbourne , Australia
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The decrease in piston speed between using a 6.125" and a 6.25" rod would be negligible. If the 6.25" are the right price, that would be reason enough for me.
Alan Jones
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Re: WHAT ROD LENGTH?
[Re: LA360]
#882278
12/17/10 06:02 PM
12/17/10 06:02 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
The decrease in piston speed between using a 6.125" and a 6.25" rod would be negligible. If the 6.25" are the right price, that would be reason enough for me.
BUT... can you get a off the shelf piston... you might be spending more money for pistons VS buying a set of rods...I had to look at both for my build... I had the chevy rods and could have bought a off the shelf piston BUT my block was cut to much so I ended up having the pin moved for $30 extra... but he MAY be able to do the same... just got to look at all the angles
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Re: WHAT ROD LENGTH?
[Re: moparmacka]
#882281
12/17/10 06:39 PM
12/17/10 06:39 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Sorry didn't mention the reason for custom pistons is the heads have 55cc chamber and I will need a custom piston with a larger dish to suit our 98 pump premium and still not not affect the .040" quench, hence me considering the 6.250 rod......if that makes some sense.
Just talk to Diamond... I had them reduce the dish volume, move the pin height and open the valve relief on a shelf piston... I have a 59cc chamber
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Re: WHAT ROD LENGTH?
[Re: LA360]
#882282
12/17/10 08:01 PM
12/17/10 08:01 PM
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Joined: Nov 2006
Posts: 370 Queensland Australia
moparmacka
OP
enthusiast
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OP
enthusiast
Joined: Nov 2006
Posts: 370
Queensland Australia
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Quote:
The decrease in piston speed between using a 6.125" and a 6.25" rod would be negligible. If the 6.25" are the right price, that would be reason enough for me.
Exactly what I what I was thinking.........
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Re: WHAT ROD LENGTH?
[Re: MR_P_BODY]
#882283
12/17/10 08:04 PM
12/17/10 08:04 PM
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Joined: Nov 2006
Posts: 370 Queensland Australia
moparmacka
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enthusiast
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OP
enthusiast
Joined: Nov 2006
Posts: 370
Queensland Australia
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Quote:
Quote:
Sorry didn't mention the reason for custom pistons is the heads have 55cc chamber and I will need a custom piston with a larger dish to suit our 98 pump premium and still not not affect the .040" quench, hence me considering the 6.250 rod......if that makes some sense.
Just talk to Diamond... I had them reduce the dish volume, move the pin height and open the valve relief on a shelf piston... I have a 59cc chamber
I was thinking of using an off the shelf Chev forging and having it modfied...........most piston manufactures tell me it is sill a custom piston price though.
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