[BigT71]

ok guys, here i am again. still working on the problem of detonation here. I have replaced advance weight springs, from stock to performance back to stock. the timing is right on by last months mopar action mag and advance timing light. runs very well at idle and just off idle. killer torque. but at about half way through pedal travel it starts to detonate and then obviously loses power. where do i go now? 74 W100 with 69 318 w/ carter afb and 340 dual plane intake

 

[SeahawkDodge]

ok guys, here i am again. still working on the problem of detonation here. I have replaced advance weight springs, from stock to performance back to stock. the timing is right on by last months mopar action mag and advance timing light. runs very well at idle and just off idle. killer torque. but at about half way through pedal travel it starts to detonate and then obviously loses power. where do i go now? 74 W100 with 69 318 w/ carter afb and 340 dual plane intake

Start retarding timing a few degrees at a time until it stops. Every engine is a little different, so what works for mopar action may not work for you.

 

[chrysler300le]

Is your stock springs one light one and one heavy one? Did you do your timing by total advance at like 35 degrees btc? Are you using 318 or 360 heads on that 318?

 

[Bummo]

Whats your compression, what grade fuel, heads or block planed, any other info?

 

[BigT71]

don't know what the compression is, 89 octane w/ ethanol, from what i was told by the previous owner the heads were planed, but i don't know how much. am wondering if bad wiring to ignition system could cause the detonation, because all the wiring in the ignition system is hard.

 

[Smokey]

Well, it sure wouldn't help to have fried wires... could just be the weak spark blowing out under more load...

 

[BrianT]

WEl it seems to me that lack of spark is doing u in detonating . Toss the stock coil i got a MSD Blaster SS coil iwill sell ya dirt cheap ( i live in Valley ,ne ) Hell maybe come take a look at it too u ain't that far away lol . Grante i am no wiring magician but have a multimeter handy too .

Also knowing if you got massive resistance in the plug wires will cause it to detonate as well .

Hell give me a holler @ 402 359 8965 if u want !!!!!!!!

 

[BigT71]

buddy of mine is going to get me a copy of the mp small block book for all the readings on the wires. it's not fried (per se) but it is hard as hell (i.e. brittle). must have started demanding more from the ignition when i got the timing right. I hope so. going to call my local dealer tomorrow about the wiring harness, i think you can buy that seperately. Brian T, will call you someday. let me know what times you are available, i work in Lincoln from 3-11 tues. thru Sat. might give you a call sometime this week.

 

[BrianT]

Always home man pretty much i work at home so iam here or if need be call the cell @ 402 304 2368. Yeha man i am ususally up before noon lol