Hot Rod Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
18 Posts
Discussion Starter #1
will a cam change effect the shift point on auto trans?

before i changed cam, trans (w/shift kit) would hit hard on 1-2 shift

now it shifts lighter

p.s. also have adjustable vac modulator

engine will idle down to 700-800 in gear about 850-950
in park

seems to run ok, slight surging below 2500 rpm

thanks
R.
 

·
Premium Member
Joined
·
2,370 Posts
Well, surging quite often indicates a leak :welcome: . Do a check with some carb cleaner or whatever you prefer to use. What were your old cam specs vs. your new ones?
 

·
Race it, Don't rice it!
Joined
·
7,810 Posts
Surging on light throttle also indicates a lean carb if no vacuum leaks are detected. A conditon of booster signal at the carb caused by a longer cam.
 

·
Registered
Joined
·
18 Posts
Discussion Starter #4
new cam is comp cam XE268

old cam was isky 2800-6000 rpm.
lift was higher than new one
(measured lobes to check lift- to see if springs would handle new cam, just a double check i did check for coil bind)


thanks
R.

just checked plugs.....they are white

time for jet/rod kit.
 

·
Premium Member
Joined
·
2,370 Posts
Before you tear into the carb do a check for leaks. It will cause a system to run lean as well.
 

·
Not Considered a Senior Member
Joined
·
10,722 Posts
One thing you can do to check for leaks that`s a little cleaner is use a propane torch, start the engine, turn on the propane, and go around the carb and intake with it, if there`s a leak the engine will pull in the propane and the idle will go up.
 

·
Premium Member
Joined
·
2,370 Posts
I like to attach a hose on the end of my propane so that I can further pinpoint the leak. It makes it easier to get behind the engine to (incase the leak is towards the back of the manifold and whatnot).
 
1 - 7 of 7 Posts
Top