Hot Rod Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
133 Posts
I agree with some of the info here. Definitely check for vacuum leaks, get the timing right, valve adjustment, etc.
But a 262, [email protected] .050" needs 10-11:1? Really? Even if it's 8.5 I would think it should run ok. Do you think a 262 is THAT big of a cam, even in a 283? Maybe 10:1 would be ideal, tho. (would that mean a 280 Magnum cam needs 12-13:1 then?) Or are you saying smaller motors need to have higher CR than larger motors with the same cam?

IS IT OFF A TOOTH?

You did state that when put in gear, it "drains the motor down". Maybe it does have a vacuum leak or a carb problem...or a way tight converter.

If you're not going to change heads yet, maybe try advancing the cam another 2 deg (over the 4 deg Comp already has in it). I agree, definitely get a higher stall converter no matter what. I would do that before gears.
Would like to see how it makes out!
 

·
Registered
Joined
·
133 Posts
I'll check er out, thanks. Just seems to be a fair amount of contradiction on builds sometimes. A 274xe is fine with 9:1 (((didn't say ideal))) but hearing a 262xe needs 10+ just makes me wonder. I do know that a smaller motor needs more static CR to keep up the dynamic CR vs a larger motor with the same cam.....just don't see it being a huge difference.
Thanks.
 

·
Registered
Joined
·
133 Posts
. Yes, any motor with any cam will start and run... old OilPull engines with 3:1 compression ratio will chug along at 160 RPMs flat out... will it perform very well power curve wise and MPGwise in the modern sense? No, to one extent or the other...

. Hublee, where are you located, might put that in your profile... prolly members here near you...

. Sorry if we got carried away in a discussion here that maybe you didn't understand... to put it simply, you have a good engine... you have a good cam... but they don't work well together... as you've discovered...

. If you want to put a minimal amount more money in it to fix it, you need a smaller cam... sell the other one... it will prolly cover the cost of the smaller one... like a Summit K1101... (you'll be out labor costs if not doing it yourself)... your engine came stock with something like a K1100...

. If you want to keep the current cam, which at
I posted a little while ago about advertised duration vs compression. That Summit cam has 270 vs 262 for the Comp. So the later intake closing point of the Summit cam will build more cylinder pressure than the shorter Comp? I'm really asking, by the way, not being a schmarty. I've always thought that 2 cams with the same duration @ .050, the one with less advertised doesn't need as much compression because the intake valve closes earlier.
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top