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Author
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Topic: whats the hp difference between ...
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methylated
Journeyman Posts: 25
From: wytheville,va usa
Registered: Mar 2003
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posted 04-03-2003 08:29 PM
   
trw pistons and top of the line ,like say cp. Assume same weight ,same compression etc the main difference being cps have a much smoother ring land surface . about how much vacuum ,tq, hp is this worth ?approximately .Anybody know or care to hazard a guess?
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Ryan Wilke
Gearhead Posts: 1145
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 04-04-2003 09:31 AM
I'll hazard a guess that the HP difference wouldn't be measurable -- rather it would be a difference of longivity and reliability.You'll likely only get personal testimonials that go either way. Ryan 
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Hans olsson
Gearhead Posts: 264
From: Sweden
Registered: Apr 2000
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posted 04-04-2003 11:17 AM
About a tenth in the quarter mile.------------------
- 71 Mach1 351c
- E/SA 11.89-110 mph
- F/SA 11.76-111 mph
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methylated
Journeyman Posts: 25
From: wytheville,va usa
Registered: Mar 2003
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posted 04-04-2003 01:02 PM
!!!!! no joke hans ?
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Hans olsson
Gearhead Posts: 264
From: Sweden
Registered: Apr 2000
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posted 04-04-2003 01:03 PM
NO ------------------
- 71 Mach1 351c
- E/SA 11.89-110 mph
- F/SA 11.76-111 mph
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methylated
Journeyman Posts: 25
From: wytheville,va usa
Registered: Mar 2003
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posted 04-04-2003 01:53 PM
yowzah !!!!1 
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Mpcoluv
Gearhead Posts: 847
From: Charlotte NC usa
Registered: Apr 2001
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posted 04-04-2003 04:40 PM
Hans,
Am I correct to assume that you will get better ring seal with the premium pistons?[This message has been edited by Mpcoluv (edited 04-04-2003).]
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Fordwiser
Gearhead Posts: 186
From: Metamora, Illinois
Registered: Dec 2000
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posted 04-04-2003 06:04 PM
Most of the top line pistons are going to be lighter then TRWs or at least they should be. I would think that would be the biggest improvement in performance and being much easier on the bottom end of the engine. TRWs can take a beating, but have extra mass to gain the strength.
Roger
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methylated
Journeyman Posts: 25
From: wytheville,va usa
Registered: Mar 2003
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posted 04-04-2003 06:16 PM
The way I meant to phrase that was in such a way that the only variable was the smoothness of the ring land . I know trws weigh more etc , but I was trying to isolate it to one variable , you see certain piston companies go to a hell of a lot more trouble in finishing the ring lands . The improved sealing is what I'm curious about.
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Buster
Gearhead Posts: 536
From: Orlando
Registered: May 2002
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posted 04-04-2003 06:52 PM
It depends what TRW pistions your using.... I have seen TRW crack the skirts in all eight pistions.And yes it would put together properly. I also have heard that Chevy uses the same pistion, just a different pit location. I was talking to a friend that builds chevy's and he had the TRW pistion crack in two different engines. He took the broken parts and was able to switch them between the two pistons and you couldn't tell which one went to what pistion. As you can tell, I DON'T like TRW pistions.
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