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Search found 134 matches

by Firedome8
Sun Jan 24, 2021 11:16 am
Forum: Engine Tech
Topic: HEI or MSD box
Replies: 27
Views: 1278

Re: HEI or MSD box

One aspect to a capacitive discharge ignition as opposed to an inductive system is the cd can fire a partially fouled plug and also fire at full energy at a significantly higher rpm due to the way it generates the spark. An inductive ign turns on the coil and builds up a magnetic field (Slow) and th...
by Firedome8
Thu Jan 07, 2021 1:41 pm
Forum: Engine Tech
Topic: Ignition , combustion statement
Replies: 14
Views: 1090

Re: Ignition , combustion statement

I still use my champion spark plug cleaner tester. This is a scope display at full load 10 psi boost.

https://youtu.be/vOmPW-ze3Tc
by Firedome8
Thu Jan 07, 2021 10:03 am
Forum: Engine Tech
Topic: Well well..I knew it wasn't that lean!
Replies: 23
Views: 3289

Re: Well well..I knew it wasn't that lean!

My PLM does free air calibration. I recommend a chassis dyno session to sort out the full throttle mixture jet for best HP and then look at the mixture strength. Plug readings are great especially if your heat range is appropriate. My plm has served me well for 17 years now. I season the sensors in ...
by Firedome8
Thu Nov 05, 2020 6:03 pm
Forum: Offtopic Forum
Topic: CRS syndrome
Replies: 16
Views: 1497

Re: CRS syndrome

I just had the fricking thing a minute ago...
by Firedome8
Sun Oct 25, 2020 7:08 pm
Forum: Engine Tech
Topic: Ignition advance at cruise rpm?
Replies: 44
Views: 1915

Re: Ignition advance at cruise rpm?

20201025_190521.jpg
20201025_190530.jpg
by Firedome8
Thu Oct 22, 2020 9:52 pm
Forum: Engine Tech
Topic: Ignition advance at cruise rpm?
Replies: 44
Views: 1915

Re: Ignition advance at cruise rpm?

On a chassis dyno at say 40mph set the timming for the highest vacuum at that speed and then road test. Just thinking as the efficiency of the burn reaches optimum you will have less throttle position for the same speed. Your Thoughts ?
by Firedome8
Mon Jun 01, 2020 1:26 pm
Forum: Engine Tech
Topic: Dominator - can't even get it to idle
Replies: 119
Views: 5476

Re: Dominator - can't even get it to idle

You do not set the power valve opening by idle vacuum. This is wrong. Mark W has posted a video to you tube proving the power valve won’t open at idle. Thanks, ClassAct. Yes, I remember those discussions here some years back. Always interesting....... https://www.speed-talk.com/forum/viewtopic.php?...
by Firedome8
Mon Jun 01, 2020 1:21 pm
Forum: Engine Tech
Topic: Dominator - can't even get it to idle
Replies: 119
Views: 5476

Re: Dominator - can't even get it to idle

Actually the other way around Harry. Three circuit carbs have a serious issue of part throttle over rich conditions followed by over lean conditions on the top end. The intermediate circuit has it's own feed directly from the float bowl and depending on the feed tube placement, draws fuel early in ...
by Firedome8
Sun May 31, 2020 2:18 pm
Forum: Engine Tech
Topic: Dominator - can't even get it to idle
Replies: 119
Views: 5476

Re: Dominator - can't even get it to idle

Is fuel issuing from the boosters at idle?
by Firedome8
Sun May 17, 2020 10:06 pm
Forum: Engine Tech
Topic: Tuning my new engine
Replies: 37
Views: 2615

Re: Tuning my new engine

Find a local chassis dyno, the operator will likely be more experienced in getting your tune up sorted out..
by Firedome8
Thu Apr 30, 2020 5:43 pm
Forum: Engine Tech
Topic: parasitic spark pre-ignition
Replies: 4
Views: 483

Re: parasitic spark pre-ignition

just wound this video about parasitic spark pre-ignition from bundled spark wires. he has neat test set up and explanations, https://www.youtube.com/watch?v=8YToXdWQEFE . A Service bulletin for small block chevys I believe identified this for cylinders 5 7 and and cautioned to keep the original wir...
by Firedome8
Sun Feb 09, 2020 6:02 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 7522

Re: Why does a tighter lsa need more compression?

Is the term VE also a misnomer ? Doug Roe refers to DE density efficiency..