batmb13

how do i adjust my secondaries. i have a 350 and i just it out for a spin. i floored it and it would not go past 5800 rpms. is that the secondaries if so how do i fix it.

xpndbl3

would not go past 5800 rpms because of valve float probably or the auto trans shifts there. has nothing to do with secondaries on carb opening or not, probably valve float though.

84firebird

or super advanced timing does that too, like past a certain point you dont detonate but you have an issue up top, you keep it on the floor and you dont go, so check it with a light if you arent positive, just my 2 cents

batmb13

what should the timing be at?

angel71rs

Best timing is very dependent on your particlular combination. Most traditional SBCs do ok with 10* initial, 36 total. But 2nd the valve float theory.

If you have a vacuum secondary carb, and want to verify the secondaries are opening, read my post in this thread:

http://web.camaross.com/forums/showt...ight=secondary

batmb13

now this might sound dump but where is the valve float and what does thAT do. plese be spefic and tell me all details, im desperatwe to get this car running strong.

batmb13

sorry cant type.lol

xpndbl3

valve float is due to inadequate valve spring pressures causing the valves to hit the valve seat and bounce back open. any reason you want to spin your motor past 5800 RPM? does it even make power up there and is your combo setup accordingly?

batmb13

i got the preformer intake that produces power from 1500 to 6500. how easy is it to fix the valve float.

batmb13

i dont know most of the things that were done to the engine. i uncle did all the stuff to it and for the live of him canot remember what he did to it. he did tell me that he use to take it up to 7200 rpms. im surprised i still had a motor. all he remembers is puting in the largets cam you can put in before changing to solid lifters.

xpndbl3

the intake has nothing to do with valve float, and it sounds like your combo isn't setup for high rpms, solid lifters are typically used when spinning a motor that high. My old motor used to break up around 5700 or so so I never spun it past that.

Angelis83LT

typical sbc would float the valves areound 5800 if the engine has a bit of milage.. but still the best you could get away with is maybe 6k... What he is getting is the valve float... where he has it mashed to the floor, and can not go any faster. One question about that though.. what gear were you in when you hit that point? were you in your final drive gear? If so.. how fast do you really need to go... cause to hit 5800 in a final drive.. you have to be moving along at a pretty good rate

84firebird

assuming 3.43 rear end (maybe it has 4.10s that'll knock it down 20 mph or so at those speeds) and a 1.0 final gear, 5800 puts you around 135 with 26.5" tall rubber, a little bit over the speed limit on american roads, i hope that you're not complaining about performance at those speeds for a non drag race motor

Angelis83LT

thats assuming he does not have overdrive.... which you can squeeze a few more mph out of it... if you let off the throttle.. hmm. but i do suppose flat on the floor would be a 1.0... unless it had a 6spd in it.... lol that gets into a whole nother bit of scary if you figure in that speed

batmb13

it was in first gear. and i have 4.11 in it