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-   -   Spark Plug Heat ranges, what gains have you made? (https://classracer.com/classforum/showthread.php?t=80154)

MoJo Risen 08-28-2021 06:31 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by Terry Cain (Post 646538)
NHRA DOES check wrist pin location. Ask David Walther or Tom West. 1972 winners of div race at Muncie, IN until getting tossed for have stocker pistons in backwards. It's all been tried. Nothing new.
Thank you for some clarity.

Why isn't the stock offset listest in accepted pistion?

Terry Cain 08-28-2021 06:36 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by MoJo Risen (Post 646539)
Thank you for some clarity.

Why isn't the stock offset listest in accepted pistion?
Probably because it might not be a checking point now. Not sure. Need to ask Tech. Back in 1972 you couldn't run replacment pistons. Had to run OEM.

MoJo Risen 08-28-2021 08:14 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by Terry Cain (Post 646538)
NHRA DOES check wrist pin location. Ask David Walther or Tom West. 1972 winners of div race at Muncie, IN until getting tossed for have stocker pistons in backwards. It's all been tried. Nothing new.
Thank you for some clarity.

Why isn't the stock offset listed in accepted pistons?

GTX JOHN 08-31-2021 12:50 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Pin offset is no longer an issue that Tech is concerned.

CMcAllister 08-31-2021 01:37 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
It ain't 1972 anymore.

Rob Petrie E395 08-31-2021 04:37 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
David Frieburger (might be spelled wrong) from Hot Rod magazine, engine masters, road kill ect ect. Just posted within the last couple of days that they tried the reverse piston trick on a 360. They saw no changes on the Dyno.

Terry Cain 09-01-2021 07:49 AM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by CMcAllister (Post 646752)
It ain't 1972 anymore.
Yep. Back then they HAD TECH.

Ralph A Powell 09-01-2021 01:14 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
I now for a fact on the Boss 302 it was worth 10 hp as I was at Dyno the night we run it.

Stan Weiss 09-01-2021 01:39 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by Ralph A Powell (Post 646825)
I now for a fact on the Boss 302 it was worth 10 hp as I was at Dyno the night we run it.

Ralph,
Do you happen to know how much offset that piston has?


Bore = 4.0 Stroke = 3.0 Rod Length = 5.155
Wrist Pin Offset = 0.06
Actual Piston Stroke 3.00022203042
Cylinder Volume 37.701902 CI 617.823481 cc
Engine Size 301.615216 CI 4942.587850 cc
Crank Angle Piston TDC -0.51657300450 Piston BDC 179.05939775907



Stan

MoJo Risen 09-01-2021 01:41 PM
Re: Spark Plug Heat ranges, what gains have you made?
 
Quote:
Originally Posted by Ralph A Powell (Post 646825)
I now for a fact on the Boss 302 it was worth 10 hp as I was at Dyno the night we run it.
Thats approximately 2.5% gain?

There is more potential HP in a corrected Piston pin offset.

I'm glad we all know now that NHRA DOES NOT TECH THIS FEATURE.


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