[BowtieAaron]

Well, im thinking about bumping the timing up on the 305. its at 0* right now. i heard they dont like to be anymore than 6-8*, is this true?
is initial the same thing as total timing? and total is when the vacuum advance is disconnected right? this is the 1st time i will be bumping timing, so i just want to make sure i do it right.

also what is a good way to start? should i disconnect vac. advance and set it, or let it on, and set it, then check it with disconnected?

thanks for the help.

aaron

 

[plain 69]

Just bump the timing up 12 degrees and feel the extra power. 305's Respond well to advancing the timing just like the bigger motors.

 

[BowtieAaron]

are you serious? i thought they didnt like the higher timing? and is 12*'s with vac. advance disconnected?

thanks man. ill let ya know how she runs when its done.

aaron

 

[wanarace]

Unplug the vacum, rev up the motor untill all the mechanical advance is gone, and set that to 36 degrees. You will need timimg tape or a dial back light to set it. Just setting initial is too much of a guess since distibutors can have varying degrees of mechanical advance in them. 36-38 degrees is usually what most SBC like.

Just as a reference, the 305 is my Cutlass has the timming set at 36deg all in by 3000rpm (spring change) That made my initial 20 degrees, but no problems so far, and it always starts.


Steve

 

[novaderrik]

unhook the vacuum advamce and pull the timing ahead to abotu 10-12. seems to work as a good baseline on pretty much any small block.

 

[BowtieAaron]

thanks alot guys. i will try it tomorrow. i guess i will have to buy some timing tape, and throw it on. oh btw, this is a completly stock engine, that has the crane XRi electronic module in it.
thanks again.

aaron

 

[Slowpoke70]

I guess I was the one that told you 6-8degrees.

That's all my stock 305 ever wanted, but maybe it had something to do with the TBI head design? I dunno.

Good luck.

 

[BowtieAaron]

idk, but i have heard from a nuch of ppl that i shouldnt run alot of deg. oh well. we will see tomorrow. was ur computer controlled? that could be why.

aaron

 

[Slowpoke70]

No, it was once upon a time when it was in a camaro, but by the time it reached my 'velle it was carbureted and no longer connected to an ECM, nor did it have the comp-controlled distributor either.

Hope yours works out. I've heard they tend to respond to tuning better with the old style (older 60s-70s), the TPI heads and Vette-type heads.

 

[BowtieAaron]

i went to mess with timing, and well... when i thought it was at 0* it was at 8*, so i left it be. didnt feel like messing with it, and my tab only goes to 8*, and i dont have any of that tape stuff.

thanks for the help guys.

aaron

 

[greg_moreira]

I agree with slowpoke, be careful with the 305. Many of them have poor combustion chamber design and do not like a lot of timing. Depending on the cylinder head, some are pretty prone to detonation and that aint gonna help out peformance.