rear tire smoking question
January 6th, 2012, 03:25 AM
#121
Seasoned beater pilot.
Join Date: Jan 2007
Location: Chicago
Posts: 5,468
The 1 thing i now from my car is the timing.
Somehow it is afecting the lower rpm torque.
If i set it back like chainging the lightest springs to bleu and silver, in staed off the 2 lightest ones i have installed it would not spin from the start.
i tried it but the engine drops almost dead off the amound of feul.
And still do not understand why
I had my timing and distributor mounted by my enginesuplier, and with the timing set on 14 and the 2 lightest springs i have the clossest mach from the data on my timing thread.
Mybe with a dyno and carb rejetting a can get more out of it.
And i'm curious about the hp and torque.
My goal with this engine was to get as much torque i can get in lower rpm's to get it's big *** moving from start.
And i'm not racing it,
In fact i have a 455 with dished silvolite piston (8.5 or 9 at most i think) and a cam MC1287 from melling with melling pushrods, and perfact circle piston rings. and G heads
a melling oilpump
And it is a rebuild crate longblock
That is what my engine suplier told me, but the engine specs were somewhere lost between the states and the netherlands.
I did mount a performer intake and carb and duals without H or X pipe (still in progress)
Next time i gonna rebuilt it over here and choose my own internal parts.
Somehow it is afecting the lower rpm torque.
If i set it back like chainging the lightest springs to bleu and silver, in staed off the 2 lightest ones i have installed it would not spin from the start.
i tried it but the engine drops almost dead off the amound of feul.
And still do not understand why
I had my timing and distributor mounted by my enginesuplier, and with the timing set on 14 and the 2 lightest springs i have the clossest mach from the data on my timing thread.
Mybe with a dyno and carb rejetting a can get more out of it.
And i'm curious about the hp and torque.
My goal with this engine was to get as much torque i can get in lower rpm's to get it's big *** moving from start.
And i'm not racing it,
In fact i have a 455 with dished silvolite piston (8.5 or 9 at most i think) and a cam MC1287 from melling with melling pushrods, and perfact circle piston rings. and G heads
a melling oilpump
And it is a rebuild crate longblock
That is what my engine suplier told me, but the engine specs were somewhere lost between the states and the netherlands.
I did mount a performer intake and carb and duals without H or X pipe (still in progress)
Next time i gonna rebuilt it over here and choose my own internal parts.
A performer intake and duals should help as well..
If your timing is good, it has to be the carburetor, trans slipping, or your engine builder did not degree the cam in correctly and it's lousy in the bottom end.
It is not your rear gear's fault in my opinion. I could smoke one tire with a 307motor and a 2.41 gear.
So that whale of yours should sit and smoke them all day long.
That cam is somewhere around 195/205@ .050 if I remember correctly so that tells me that it most likely doesn't have much compression at all.
Could also be your problem. It could just be flat out gutless somewhere between 7.5 and 8:1 compression
January 6th, 2012, 06:24 AM
#122
Registered User
Join Date: Nov 2010
Location: St Louis, MO
Posts: 904
If your car is a dog out of the hole, the engine is fresh, timing and carb are good, I'm guessing the cam is the issue.
Way too many people put in big cams with lots of overlap. all that does al low rpm is bleed down compression. That's really bad on low compression engines.
What are the cam specs, lsa?
Way too many people put in big cams with lots of overlap. all that does al low rpm is bleed down compression. That's really bad on low compression engines.
What are the cam specs, lsa?
January 6th, 2012, 06:40 AM
#123
Connoisseur d'Junque
Join Date: Sep 2010
Location: The Hudson Valley
Posts: 21,183
If you don't have the data to calculate it, what sort of numbers do you get from a compression test? That could explain it.
- Eric
January 6th, 2012, 08:52 AM
#124
Registered User
Thread Starter
Join Date: Apr 2007
Location: Emmen Drenthe (Netherlands)
Posts: 586
i dont have a problem of smoking those tires,
even from 15mph it will spin.
Reason of typing my previeus reply is that in my case the timing was a big difference
it is much stronger v.s. my 69 350, if they told me corectly the compresion is only 8.5
found it strange that other people with the big B body's can't spin them
also the reason i want to do a dyno.
he told me the specs, but could'nt vind the tag of it.
That's lost somewere.
But if i have the low comp pistons, no problem.
next time high comp istons in it.
can i sort it out with a compresion test normaly used to detect a headgasketleak?
cam should be 196 208 @.050 and ( 274 /296)
even from 15mph it will spin.
Reason of typing my previeus reply is that in my case the timing was a big difference
it is much stronger v.s. my 69 350, if they told me corectly the compresion is only 8.5
found it strange that other people with the big B body's can't spin them
also the reason i want to do a dyno.
he told me the specs, but could'nt vind the tag of it.
That's lost somewere.
But if i have the low comp pistons, no problem.
next time high comp istons in it.
can i sort it out with a compresion test normaly used to detect a headgasketleak?
cam should be 196 208 @.050 and ( 274 /296)
Last edited by D Appeldorn; January 6th, 2012 at 08:58 AM.
January 6th, 2012, 08:57 AM
#125
Connoisseur d'Junque
Join Date: Sep 2010
Location: The Hudson Valley
Posts: 21,183
Your cam will affect the compression read by the gauge, so if it's got a lot of overlap, it will read low, even if it's numerically high, but since you're talking about low-RPM performance, if it read very low, then you'd have reason to believe that either your compression was to low, or your cam was too radical for low-RPM performance.
If the cam were stock, the reading would give you a good idea of what the compression was, in comparison with other stock engines.
- Eric
January 6th, 2012, 09:28 AM
#126
One part at a time
Join Date: Jun 2010
Location: Missouri
Posts: 167
Did somebody say burnout?
I didn't go over 4500 RPM in this one, no secondaries either...
http://vimeo.com/32688961
Olds time is fun time!
I didn't go over 4500 RPM in this one, no secondaries either...
http://vimeo.com/32688961
Olds time is fun time!
Last edited by 67 442; January 6th, 2012 at 09:32 AM.
January 6th, 2012, 05:08 PM
#127
Registered User
Join Date: Oct 2011
Location: Wisconsin
Posts: 154
I remember back when I was in high school a buddy decided to do a big burnout in the school parking lot. After about twenty feet or so of a posi burnout he hit a little hump and the rear end jumped up. He regretted that as it not only destroyed his rear end but the quarter panel as all the left lugs sheared off the rim ended up under the quarter panel and a few other things were destroyed that I don’t remember toasted a nice 70 GTO. And well instead of wow cool burnout he had everyone laughing at him.
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