[Stan Weiss]

Originally Posted by GTOGEORGE

Funny story about carbs and Roots Blowers......A friend of mine has a Roots Blower BB Chevy Dragster that runs Top/Dragster (Very Fast) any ways he at one time took the jets out of his carbs (2 - APD Alcohol Dominators) and he couldn't tell the differences........pretty funny!! Also adjusting the floats on them he said to put a piece of tape over the site glass window and raise the floats until they are pouring in the engine then start backing them off a little at a time when they stop then leave them at that........blower engines need a lot of fuel! True Story!


GTO George

Pontiac had the solution 60 plus years ago Tri-Power. Just add a 3 carb.

Stan

[GTOGEORGE]

Originally Posted by Stan Weiss

Pontiac had the solution 60 plus years ago Tri-Power. Just add a 3 carb.

Stan

I thought of a Tri-Power set up (om top of the blower) using split dominators but never followed through.........I mean what's a GTO without TRI-POWER!


GTO George

[GTOGEORGE]

I got my car back together and started it up……sounded pretty good, hopefully everything will be ok at Norwalk. Should be loading it up Monday!



GTO George

[GTOGEORGE]

Well my car didnt get loaded Monday........had an issue with the delay box (it wasn't working). So the "Chinese Fire drill" we had to get my Bump box working last time at the track we did something to mess with my delay box..............soooooooo I took me a while to get it working (actually it was the two step). I did get it loaded on tuesday so hopefully everything will be fine for my first pass on Friday!


GTO George

[GTOGEORGE]

All packed!


GTO George

[twooldgoats]

Good luck, George.
Jim

[GTOGEORGE]

As of right now it seems my plug melting problem is a timing issue. I started pulling timing out one at a time till the plugs stopped melting…..it took a total of 3 degrees! I made 5 passes in al today all between 8.09-8.10 in the process I took 3rd place in the gamblers race…..go figure!! LOL!


GTO George

[johnta1]

I started pulling timing out one at a time till the plugs stopped melting…..it took a total of 3 degrees!

This is with your old blower setup on?
I think you need lot more fuel still. New bigger, badder carbs maybe?
(better still injection )

[GTOGEORGE]

Originally Posted by johnta1

This is with your old blower setup on?
I think you need lot more fuel still. New bigger, badder carbs maybe?
(better still injection )

Yes I agree with still needing more fuel…..I raised the shift points to 6 600 from 6,400 and it melted two plugs (2,4). So my last q16 time pass I lowered it back and no melted plugs….. weird! Yes my old blower with the same set up as always., only difference is new hp heads from KRE, I’m assuming better chambers then the 2007 heads needs a lot less timing!


GTO George

[Jack Gifford]

Congratulations on your finishes George!
Thanks for stopping by.

[GTOGEORGE]

Originally Posted by Jack Gifford

Congratulations on your finishes George!
Thanks for stopping by.

It was nice seeing you again!


GTO George

[GTOGEORGE]

Originally Posted by johnta1

This is with your old blower setup on?
I think you need lot more fuel still. New bigger, badder carbs maybe?
(better still injection )

Thinking about a different intake for next year……..then who knows what else I’ll do!


GTO George

[Stan Weiss]

George,
OK you changed a number of parts and had a problem burning plugs.

You made the wrong assumption that it was the new blower and changed back to your old blower and still had the plug burning problem.

Now forced to look elsewhere you found the engine did not like the same time as before you change parts.

So now, before you just throw / fling some more new parts at it. Put the new blower back on and tune the engine to it and see what the car will do.

Stan

[GTOGEORGE]

Originally Posted by Stan Weiss

George,
OK you changed a number of parts and had a problem burning plugs.

You made the wrong assumption that it was the new blower and changed back to your old blower and still had the plug burning problem.

Now forced to look elsewhere you found the engine did not like the same time as before you change parts.

So now, before you just throw / fling some more new parts at it. Put the new blower back on and tune the engine to it and see what the car will do.

Stan

Yes you are kinda correct, I made 2 changes in the beginning of the year, I knew the blower was going to need a tuning change, the heads threw me i wasn't expecting that. I tried fuel first (with the new blower) and that didnt work, i didnt have time to trouble shoot the new blower because Norwalk (Pontiac race) was up next so i went back to my old blower and tune. When the engine started to eat plugs (first pass on Friday) and I had the fuel system maxed out the next change was timing! It took a few rounds in eliminations to get it to stop eating plugs (took 3 degrees of timing out). The next day (Saturday) when i checked the plugs after taking 3rd place they were all good (it was a late finish on Friday). So I raised the RPM shift point up 200 RPM and it melted the plugs again.....that was the only change from the day before......so for the next pass i went back on the shift point and no melted plug. That would mean a fuel problem.....now my fuel pressure sending unit stopped working at the last race (its on order) so i have no idea what the issue is......the fuel pump or i just need to upgrade again which would be weird because its the sam set up ive been running for the last 4 years....except the heads (shouldn't cause a fuel problem). Even with the plug issue I still took runner up in the Q16, the car was awesome it ran/or would have run 8.15 every pass!! Not bad for a Blower car!


GTO George

[GTOGEORGE]

So basically im looking into another blower intake for my car (anyone have one)? I plan to do some kind of upgrade in the fuel department (i have no idea). It wont be easy because i run Nostalgia races.........they don't allow electronic fuel injection........soooo! I also need it to start without a second person...its a Bracket car!

GTO George

[Tom Vaught]

Originally Posted by GTOGEORGE

When the engine started to eat plugs (first pass on Friday) and I had the fuel system maxed out the next change was timing! It took a few rounds in eliminations to get it to stop eating plugs (took 3 degrees of timing out). That would mean a fuel problem.....now my fuel pressure sending unit stopped working at the last race (its on order) so i have no idea what the issue is...... GTO George

Then you raised the RPM 200 and it ate plugs again.

Thanks for now having some data that says you have a fuel problem.
And it probably is not the fuel pump. 200 rpm and you fall off the cliff says you have a fuel restriction someplace that is fine at the lower rpm but when you add 200 engine rpm, you have a restriction in the fuel system.

Think I said that a while back, as did several others on the board including Jim.
I just agreed with what they posted in the past so don't come after me for agreeing with their initial assessments.

Tom V.

[johnta1]

George, with the higher flowing heads it would probably use at least 100lb/hr more fuel. (don't know your specs and not figuring in blower)
If the fuel pump is not capable of keeping up with the increased fuel demand, that would be a problem. If the carbs are not capable of keeping up with the fuel demand that would be a problem. Then also if the intake can't keep up with the extra mixture, that would also be a problem.
Then the new bigger blower would be even a lot more of a demand.
Now if all are not capable, WOW.

Plus using alcohol it would make a huge demand on the system. Gasoline may be OK, but it takes a lot of alky to run.

[GTOGEORGE]

Originally Posted by johnta1

George, with the higher flowing heads it would probably use at least 100lb/hr more fuel. (don't know your specs and not figuring in blower)
If the fuel pump is not capable of keeping up with the increased fuel demand, that would be a problem. If the carbs are not capable of keeping up with the fuel demand that would be a problem. Then also if the intake can't keep up with the extra mixture, that would also be a problem.
Then the new bigger blower would be even a lot more of a demand.
Now if all are not capable, WOW.

Plus using alcohol it would make a huge demand on the system. Gasoline may be OK, but it takes a lot of alky to run.

im willing to switch to a mechanical fuel injection BUT first i need a new blower intake.....im looking!


GTO George

[GTOGEORGE]

Originally Posted by Tom Vaught

Then you raised the RPM 200 and it ate plugs again.

Thanks for now having some data that says you have a fuel problem.
And it probably is not the fuel pump. 200 rpm and you fall off the cliff says you have a fuel restriction someplace that is fine at the lower rpm but when you add 200 engine rpm, you have a restriction in the fuel system.

Think I said that a while back, as did several others on the board including Jim.
I just agreed with what they posted in the past so don't come after me for agreeing with their initial assessments.

Tom V.

I always new i was limited with my fuel system. first i need to find out what my fuel pump is doing, except for the heads every thing is the same and the heads are basically the same as old heads just a little better composition chamber. ive run 8.0's all day long at 6,800 rpm before without melting plugs with this set up....you need to listen better! Go back to watching tv in your chair old man! LOL!
..........and i still made the KRE Quick 16 finals!!!

GTO George

[Stan Weiss]

When you raised the RPM and it burnt the plugs again.

Did anyone read the plugs? Or are you just assuming it is the fuel system.

Have you or anyone that can help you ever run a mechanical fuel injection system?

I believe they have systems today you can add to make them one person start. It sure was not that way back in the 70's when I help a friend tune a N/A Hilborne injected 426 Hemi.

Stan

PS Also with as many runs as you have made burning plugs. Have you done a leak down test on those cylinders?