Spark Plug Heat ranges, what gains have you made? - Page 2

MoJo Risen · 08-28-2021, 06:31 PM

Quote:

Originally Posted by Terry Cain

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

Quote:

Originally Posted by MoJo Risen

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

Quote:

Originally Posted by Terry Cain

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

Pin offset is no longer an issue that Tech is concerned.

CMcAllister · 08-31-2021, 01:37 PM

It ain't 1972 anymore.

Rob Petrie E395 · 08-31-2021, 04:37 PM

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

Quote:

Originally Posted by CMcAllister

It ain't 1972 anymore.

Yep. Back then they HAD TECH.

Ralph A Powell · 09-01-2021, 01:14 PM

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

Quote:

Originally Posted by Ralph A Powell

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

Quote:

Originally Posted by Ralph A Powell

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.

08-31-2021, 12:50 PM	#14
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,707 Likes: 2,732 Liked 2,395 Times in 678 Posts	Re: Spark Plug Heat ranges, what gains have you made? Pin offset is no longer an issue that Tech is concerned. __________________ John Irving 741 Stock 741 Super Stock

08-31-2021, 01:37 PM	#15
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 598 Likes: 15 Liked 882 Times in 245 Posts	Re: Spark Plug Heat ranges, what gains have you made? It ain't 1972 anymore.

08-31-2021, 04:37 PM	#16
Rob Petrie E395 VIP Member Join Date: Dec 2007 Location: Woodlawn IL Posts: 1,092 Likes: 162 Liked 216 Times in 77 Posts	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.

09-01-2021, 01:14 PM	#18
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 385 Likes: 2 Liked 225 Times in 136 Posts	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.