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-   -   LOST 10mph AND ABOUT 6 TENTHS (https://classracer.com/classforum/showthread.php?t=78007)

monte8616 12-05-2020 08:44 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Quote:
Originally Posted by Jeff Stout (Post 629310)
Not to bash, but it was a Barry Grant pump. It was aerating the fuel. So the gauge was actually air/ liquid pressure. No O2 sensor at the time. Also at the time I was not to smart and threw about 1500.00 and 7al, wires, new tach, plugs. Checked valve springs twice. Cam timing, compression test. Three different outings at track. It was a real learning experience.
I don’t have an O2 sensor yet either... we did the new plugs and wires too! Brand new MSD too lol - what’s interesting is that we originally thought that it was the MSD box because when we changed the box and made a pass, it went back to what it should’ve been running - then, after that, it went back to being slow again... ugh

monte8616 12-05-2020 08:52 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Quote:
Originally Posted by MR DERBY CITY (Post 629297)
Check fuel system, , the 30 second jug test is a good start, replace the battery/batteries....Have you done any welding close to the car ? .....Some racers have reported that their car became MAGNETIZED and they lost plenty of ET and MPH ......3 ideas to PONDER ......
What else do you know about the magnetized thing? Very interesting...

Jeff Stout 12-05-2020 09:00 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Quote:
Originally Posted by monte8616 (Post 629315)
What else do you know about the magnetized thing? Very interesting...
I know a local racer that determined the spun bearings came from arcing on crank to bearing clearance and made pit mark's on journal. He had connected ground to block and welded on frame.

Jeff Niceswanger 12-05-2020 09:08 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
MSD's pull ,and need, about 8 amps at WOT . They also get a lot of vibration in our cars.. Put a new high current kill switch in it. Their relatively cheap.

david edwards 12-05-2020 09:12 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Ck your grounds.

James Perrone 12-05-2020 09:22 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Joey this may sound strange
Years ago Micheal Iacono built the yellow SS camaro car was brand new front to back .
Then it developed a gremlin changed everything msd fuel pump retire
Lee Zane was driving the car. Finally made few runs shutting accessories
Bad electric water pump.
Wouldn’t do it unless under a load Worth a look

monte8616 12-05-2020 09:30 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Quote:
Originally Posted by James Perrone (Post 629320)
Joey this may sound strange
Years ago Micheal Iacono built the yellow SS camaro car was brand new front to back .
Then it developed a gremlin changed everything msd fuel pump retire
Lee Zane was driving the car. Finally made few runs shutting accessories
Bad electric water pump.
Wouldn’t do it unless under a load Worth a look
Funny u say that - the fuse blows on the water pump intermittently...

monte8616 12-05-2020 09:35 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
Quote:
Originally Posted by david edwards (Post 629319)
Ck your grounds.
Did that too... :(

Bill Marshall 12-05-2020 10:19 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
[QUOTE=Jeff Stout;629310]Not to bash, but it was a Barry Grant pump. It was aerating the fuel. So the gauge was actually air/ liquid pressure. No O2 sensor at the time. Also at the time I was not to smart and threw about 1500.00 and 7al, wires, new tach, plugs. Checked valve springs twice. Cam timing, compression test. Three different outings at track. It was a real learning experience.[/QUOTE
Jeff This car use to be fuel injected and it still has the high pressure pump in it with regulator to knock down the pressure. regulator is set at 7.5 lbs also we dyno'd the engine and it still has the same power from when it was built

rognelson777 12-05-2020 10:37 PM
Re: LOST 10mph AND ABOUT 6 TENTHS
 
grounds. disconnect, add serated washers and no lock nuts. nylon in locknut can melt from cranking engine when wire gets hot.
fuel lines. any rubber can actually close down and limit flow when hot


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