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302w-best spark 

 

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 Post subject: 302w-best spark
Posted: Tue Sep 27, 2011 1:09 am 
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hi,i have 302w efis on lpg-petrol with 10-11\1 compression,using mallory coil and stock distributor,i susspect spark blow out on lpg.whats the best spark step up from the coil?

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 8:57 am 
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how tight are your gaps and what temp plugs are you running Hans?

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 11:30 am 
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1.2mm on gas plugs,i have a miss at idle i have chased for months,changed leads-3 sets with less than 1k on them,plugs the same,coils-msd,mallory,bosch,relocated the tfi unit.things will get worse when i change the top end to explorer,on my fast rebuild we used 40 thou over size flat tops and decked the block-warped,so the pistons sit flush on deck,e7s where skimed and serviced.seems to run ok after idle.i noticed a better idle with the mallory,msd coils,was thinking about a crane hi 6 or a summit system for more spark.

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 11:41 am 
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Pull your gaps down to .8 or .9

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 11:51 am 
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ill try it,thanks

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 1:18 pm 
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If you have a miss at idle, no amount of spark gapping will correct it, What condition is your Balancer in? I canged mine on saturday, it made a world of difference. Repco has powerbond on sale ATM, well, they did on saturday..

for what its worth, $160 odd, process of elimination. don't go putting second hand s**t on a motor while trying to diagnose issues, the second hand stuff might be faulty to begin with.

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 1:27 pm 
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yea i agree with the plug gaps, our old lpg au originally had the 1.3mm gap the au2 recommended and would run pretty rough, gapped them down to .88mm and was smooth as silk...lol

if that dont help there is another problem somewhere
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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 1:50 pm 
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dc_todd wrote:
If you have a miss at idle, no amount of spark gapping will correct it, What condition is your Balancer in? I canged mine on saturday, it made a world of difference. Repco has powerbond on sale ATM, well, they did on saturday..

for what its worth, $160 odd, process of elimination. don't go putting second hand s**t on a motor while trying to diagnose issues, the second hand stuff might be faulty to begin with.

my second thought,i have 3 new power bond-nuline balancers-bulk buy,$100 each a while back,or option 3-blown head gasket between cylinders.been reading your thread,nice pick up

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 2:47 pm 
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Go get your intake checked for CO2 then if you suspect a head gasket, thats the first port of call, Throw a balancer on there if you have a fistful of them, you have already spent the coin on them and they are not exactly ng to appreciate or become a rare item in your life time.

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 5:59 pm 
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dc_todd wrote:
Go get your intake checked for CO2 then if you suspect a head gasket, thats the first port of call, Throw a balancer on there if you have a fistful of them, you have already spent the coin on them and they are not exactly ng to appreciate or become a rare item in your life time.

just checked the co2-ok,my engine builder says hb is ok,investigate tomorrow

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 10:14 pm 
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Rough at idle I would be checking compression ??
On gas you MAY have valve recession or tight valve clearance..

 

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 Post subject: Re: 302w-best spark
Posted: Tue Sep 27, 2011 11:53 pm 
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EBXR8380 wrote:
Rough at idle I would be checking compression ??
On gas you MAY have valve recession or tight valve clearance..

compression test tomorrow and re gap plugs,try to locate cylinder-s,had a few gaskets blow between cylinders on I6S-gmh

 

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 Post subject: Re: 302w-best spark
Posted: Wed Sep 28, 2011 2:45 pm 
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found the problem-new leads-dead on 4-6 the rest work but could be better-sucks, 3 sets pita.

 

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 Post subject: Re: 302w-best spark
Posted: Wed Sep 28, 2011 9:08 pm 
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hans hartman wrote:
found the problem-new leads-dead on 4-6 the rest work but could be better-sucks, 3 sets pita.


you must be getting crappy leads or your just unlucky
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 Post subject: Re: 302w-best spark
Posted: Wed Sep 28, 2011 9:44 pm 
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TROYMAN wrote:
hans hartman wrote:
found the problem-new leads-dead on 4-6 the rest work but could be better-sucks, 3 sets pita.


you must be getting crappy leads or your just unlucky

top gun- :cry: :cry: eagle- :cry: :cry: have to find better as they break off the plugs

 

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