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-   -   new combo missing a bunch of power? (https://classracer.com/classforum/showthread.php?t=66261)

Hacksaw 05-16-2017 02:27 PM
Re: new combo missing a bunch of power?
 
You may have a converter issue, but if you only went 106 MPH you have a problem with power.

Mark Yacavone 05-16-2017 07:48 PM
Re: new combo missing a bunch of power?
 
Quote:
Originally Posted by pfordamx (Post 534810)
i can check stall on the transbrake right? and i can tell you it will go to 4500 easily on the brake because thats where the 2 step is but it drops a ton of rpm inbetween gears. could line pressure or trans being over full cause this type of issue? the fact that it still leaves is what makes me think the sprag is ok. i was considering raising the 2 step to 6500 and seeing where the converter stopped it. could a bad msd box cause this type of problem? the only things that aren't new are the box and plug wires. so they're pretested but 6-7 years old when everything else is relatively new.
Yes, you can check it with the t-brake....on jackstands! You'll be auditioning for Super /Gas.
Your interval times are all within reason, as far as being correct. But still seems like it would go faster than that, if the secondaries weren't working at all.

HR9121 05-16-2017 11:02 PM
Re: new combo missing a bunch of power?
 
Maybe a silly suggestion but in situations like this nothing is silly, maybe a couple plugs wires crossed.
And yes the reason I suggested it is because I done it recently and it cost me over a second in the 1/8 mile!

MR DERBY CITY 05-16-2017 11:17 PM
Re: new combo missing a bunch of power?
 
Check to make sure that carb linkage is opening all the way.....

pfordamx 05-16-2017 11:54 PM
Re: new combo missing a bunch of power?
 
god i could only dream its something as simple as some crossed plug wires.

joespanova 05-17-2017 06:15 AM
Re: new combo missing a bunch of power?
 
With that cam timing you should have pumped up about 210lbs of compression. That would be where I would have started. If not then you either don't have the compression you thought you did or the cam timing is way off.........somehow.
And as you may have already guessed , if the PTV was checked it would have been checked AFTER the cam was "phased" the way you want it.....so that was check point 1 for correct cam install. If the PTV is where it should be , you would have very little "wiggle" room to move it around and definitely no room to be a "tooth" off.

Glenn Briglio 05-17-2017 10:55 AM
Re: new combo missing a bunch of power?
 
Was this engine dyno tested? That would be the first thing done to eliminate what kind of power it makes.If engine is good then look at the rest of the car.

Dave Gantz 05-17-2017 11:13 AM
Re: new combo missing a bunch of power?
 
Quote:
Originally Posted by Bob Mulry (Post 534796)
This sounds so obvious that I hesitate to post it......

Have you rechecked your cam timing?????
Along these lines, are you getting full throttle? Sorry if that's too obvious. Just hate to see you start pulling it all apart for nothing.

randy wilson 05-17-2017 12:14 PM
Re: new combo missing a bunch of power?
 
Quote:
Originally Posted by pfordamx (Post 534810)
i can check stall on the transbrake right? and i can tell you it will go to 4500 easily on the brake because thats where the 2 step is but it drops a ton of rpm inbetween gears. could line pressure or trans being over full cause this type of issue? the fact that it still leaves is what makes me think the sprag is ok. i was considering raising the 2 step to 6500 and seeing where the converter stopped it. could a bad msd box cause this type of problem? the only things that aren't new are the box and plug wires. so they're pretested but 6-7 years old when everything else is relatively new.
The msd either runs, or it don't. Just my experience. I take it you don't have a crank trigger? The pickup will lose that much if bad, and still run.

MR DERBY CITY 05-17-2017 01:09 PM
Re: new combo missing a bunch of power?
 
Old batteries ? I know at least one prominent stock Eliminator racer that freshened his motor and later found that a weak battery was the culprit.....


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