LOST 10mph AND ABOUT 6 TENTHS

ss3011 · 12-05-2020, 08:09 PM

Check compression and leakdown , for engine health .

monte8616 · 12-05-2020, 08:15 PM

Did the fuel system test - all good - the welding is an interesting thought... batteries are pretty new - Racepak shows all good with fuel pressure... but something to think about with the volume - thanks everyone! Keep the ideas coming!!

MR DERBY CITY · 12-05-2020, 08:28 PM

Quote:

Originally Posted by monte8616

Did the fuel system test - all good - the welding is an interesting thought... batteries are pretty new - Racepak shows all good with fuel pressure... but something to think about with the volume - thanks everyone! Keep the ideas coming!!

Just curious, how much did it pump in 30 seconds,.....carry on....

monte8616 · 12-05-2020, 08:29 PM

Gallon in 18 seconds so volume is good

Jeff Stout · 12-05-2020, 08:35 PM

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.

monte8616 · 12-05-2020, 08:44 PM

Quote:

Originally Posted by Jeff Stout

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

Bill Marshall · 12-05-2020, 10:19 PM

[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

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

ss3011 · 12-06-2020, 12:19 AM

[[/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[/QUOTE]

If the engine ran good on the dyno , then what parts are different between the car and the dyno ? Usually the dyno has it's own ignition box and it's own fuel system . Maybe check these two systems out to start with .

Adger Smith · 12-05-2020, 08:36 PM

Put the 3 speed back in it...LOL
Do you run foam in the fuel cell?
Pull the cap off the fuel cell vent, check the vent for obstructions.

12-05-2020, 08:09 PM	#1
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 910 Likes: 70 Liked 239 Times in 114 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS Check compression and leakdown , for engine health .

12-05-2020, 08:15 PM	#2
monte8616 Junior Member Join Date: Oct 2010 Posts: 18 Likes: 39 Liked 14 Times in 6 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS Did the fuel system test - all good - the welding is an interesting thought... batteries are pretty new - Racepak shows all good with fuel pressure... but something to think about with the volume - thanks everyone! Keep the ideas coming!!

12-05-2020, 08:29 PM	#4
monte8616 Junior Member Join Date: Oct 2010 Posts: 18 Likes: 39 Liked 14 Times in 6 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS Gallon in 18 seconds so volume is good Last edited by monte8616; 12-05-2020 at 08:32 PM.

12-05-2020, 08:35 PM	#5
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,489 Likes: 66 Liked 706 Times in 283 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS 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. Last edited by Jeff Stout; 12-05-2020 at 08:42 PM. Reason: More

12-05-2020, 10:19 PM	#7
Bill Marshall Member Join Date: Nov 2002 Location: LONG ISLAND N.Y. Posts: 187 Likes: 126 Liked 53 Times in 24 Posts	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

12-05-2020, 10:37 PM	#8
rognelson777 Member Join Date: Dec 2010 Posts: 376 Likes: 20 Liked 135 Times in 74 Posts	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

12-06-2020, 12:19 AM	#9
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 910 Likes: 70 Liked 239 Times in 114 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS [[/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[/QUOTE] If the engine ran good on the dyno , then what parts are different between the car and the dyno ? Usually the dyno has it's own ignition box and it's own fuel system . Maybe check these two systems out to start with .

12-05-2020, 08:36 PM	#10
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: LOST 10mph AND ABOUT 6 TENTHS Put the 3 speed back in it...LOL Do you run foam in the fuel cell? Pull the cap off the fuel cell vent, check the vent for obstructions. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 12-05-2020 at 08:38 PM. Reason: finish