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Re: minimun piston compression height?
[Re: brownout]
#1519854
10/19/13 06:47 AM
10/19/13 06:47 AM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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A short compression height, 1.094 pin and aluminum rods that leave little room above the pin for valve reliefs all stuffed into a low deck? Why? It sounds like the perfect beginning for a debacle in the making.  Change that to a good steel rod and .990 pin (or smaller) and make things a lot easier on yourself.
machine shop owner and engine builder
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Re: minimun piston compression height?
[Re: viperblue72]
#1519855
10/19/13 08:32 AM
10/19/13 08:32 AM
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Joined: Oct 2006
Posts: 596
Mass.
80fbody
mopar
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mopar
Joined: Oct 2006
Posts: 596
Mass.
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Quote:
Don't know if I should weigh in on this, but I like the 1.32ch. Light piston, but pin isn't into the rings.
The pin is into the oil rings on my 1.32ch KB280 pistons. Not sure if forged would be different.
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Re: minimun piston compression height?
[Re: 80fbody]
#1519856
10/19/13 09:25 AM
10/19/13 09:25 AM
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Joined: Jan 2003
Posts: 75,047
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
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Quote:
Quote:
Don't know if I should weigh in on this, but I like the 1.32ch. Light piston, but pin isn't into the rings.
The pin is into the oil rings on my 1.32ch KB280 pistons. Not sure if forged would be different.
Forged would be very different if that KB is a hyper piston, though the 1.094 doesn't help. None of the forged .990pin pistons I've had have the pin in the oil ring.
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Re: minimun piston compression height?
[Re: brownout]
#1519860
10/21/13 07:15 PM
10/21/13 07:15 PM
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Joined: Oct 2005
Posts: 976
ontario canada
mac56
super stock
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super stock
Joined: Oct 2005
Posts: 976
ontario canada
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Quote:
Ok thanks for the infromation I spoke to Koffels and was recommended to keep the compression height to around 1.300
I also told him the application and he said still keep the 1.094 pin vs the .990 pin what do you guys think.
At this point I have the option to change the combo around I was thinking of running a 2.2 rod journal with a piston compression height of 1.3 and some aluminum rods at 6.535 with a .990 pin to lighten things up. Once again this is a nitrous motor that will see a lot of spray.
Thanks
Dan at performance only helped me pick my B1 pistons and spent a lot of time going over the details of my combo. I also run a 6.535 chev aluminum rod. I think if I remember right the compression height came in at 1.35 and I still ended up with a support rail with 990 pin. Because of Dan's relationship with Diamond he was able to get me what I felt was a great deal for superior parts. 
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Maybe the 1.094 size pin will be better also to start with also 
