High rpm misfire...SBC

[BrazilianZ28Camaro]

What heat plug are you running?

The plugs are Ac Delco 041LY6SA ( # 6 per NGK table).

Thanks

[Troy Patterson]

Pretty center section there BrazilianZ28Camaro.

You didn't say anything about the Wheaties. Maybe that's an American joke.

Troy Patterson TMPCarbs.net TMP Carbs

Thanks Troy, two days hand polishing the carb...yes,I had time

Car have a 14.5" eletric fan ...I'm concerned with the air flowing above carb...should a good air filter improve it metering and ET on 1/8 mile??

Should improve, yes.

Yeah, I know what "wheat" mean but didn't know about "Wheaties"...so I'm little off about the joke
I'm glad if you can explain it!

"Wheaties" was / is a brand of breakfast cereal. The TV commercials claimed it was the breakfast of athletic "Champions". So, it sort of became a joke about having energy and so forth.

http://www.youtube.com/watch?v=mwA0AbaONqs

I need protein to keep me going!

Troy Patterson TMPCarbs.net TMP Carbs

[af2]

Valve springs or Ignition.

Very nice elbow work on the carb!

[BrazilianZ28Camaro]

Valve springs or Ignition.

Very nice elbow work on the carb!

Thanks AF2. I think this carb is flowing a little more than 750cfm

The 292's #896 heads had the same treatment on the chambers,exaust ports and valves....415 hours of porting and polishing...friends call me crazy..

[BrazilianZ28Camaro]

"Wheaties" was / is a brand of breakfast cereal. The TV commercials claimed it was the breakfast of athletic "Champions". So, it sort of became a joke about having energy and so forth.

http://www.youtube.com/watch?v=mwA0AbaONqs

I need protein to keep me going!

Troy Patterson TMPCarbs.net TMP Carbs

Got it!

I feed the lil mouse only with Kellog's ! I think I found the misfire cause!

[Matt Gruber]

a free test for weak ignition is a tighter plug gap.
was .035?
try .025

[Troy Patterson]

"Wheaties" was / is a brand of breakfast cereal. The TV commercials claimed it was the breakfast of athletic "Champions". So, it sort of became a joke about having energy and so forth.

http://www.youtube.com/watch?v=mwA0AbaONqs

I need protein to keep me going!

Troy Patterson TMPCarbs.net TMP Carbs

Got it!

I feed the lil mouse only with Kellog's ! I think I found the misfire cause!

Got my fingers crossed. Do tell!!

Troy Patterson TMPCarbs.net TMP Carbs

[BrazilianZ28Camaro]

a free test for weak ignition is a tighter plug gap.
was .035?
try .025

I'll try that.

Wondering if the engine performance would suffer with less plug gap?

Thanks for reply

[Matt Gruber]

fixed yet?
Tight Plug gap is a test for weak ignition.
it is not the cure; it just proves weak ignition, or NOT.

[BrazilianZ28Camaro]

fixed yet?
Tight Plug gap is a test for weak ignition.
it is not the cure; it just proves weak ignition, or NOT.

Not fixed yet Matt...

I had two weekends to work on the car and do the tests but both weekends was raining really bad

I believe next weekend I can do the tests.

Reading the plugs, the center electrode seem to be "burned" correctly by the ignition energy. Engine start and runs very well but the high rpm miss.

I'm wondering if the new stock style dist. rotor and cap might be overtaxed..

Thanks for reply.