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21
Motor and Drivetrain / Re: Detonation Detection
« Last post by dsrace on November 06, 2019, 08:29:08 AM »

Yellow bullet has ,IMO,the absolute best forum info there is. LOTS of info you will not see anywhere else.

.proper timing and afr can be seen..

Bottom line is that detonation and too rich can be seen as loss of ring seal/loss of crankcase vacuum. Of course none of that info means a thing to those not running vac pumps or 3-4 or more scavenge stage dry sumps.

What got me to looking deeper into this is the old nascar SB2.2 I'm running. It had a 4 stage pump on it and no vac regulator on a sealed engine. No venting at all yet it had zero evidence of any oil leaks anywhere. Got to asking and it seems the engines drive the pump at a speed that at 9300 rpm is just right for the blowby to be perfectly balanced so as to provide around 20" vac.  Cool. Then I ran across this interesting stuff about tuning with crankcase vac readings. I guess it's not really tuning as much as being able to see the engine is happy/not happy with the tune .


reading through it last night i was starting to get the idea this type crank case checking required a vac pump.   still info i have never heard before! good info worth the read even for those that aren't using pumps on the ccv.
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Motor and Drivetrain / Re: Detonation Detection
« Last post by fabr on November 05, 2019, 06:44:53 PM »
As a side note,I am going to shelve my 3 stage pump and going to a 5 stage to be able to not run valve stem seals as can be done with 10-15" crankcase vacuum -with the now known added bonus of detecting detonation . COOL! Since I will not be running at a constant rpm I will use a vacuum regulator in one valve cover and a one way vent in the other.

Not running valve stem seals is said to allow ample lube of the skinny titanium valve stems so as to not risk galling while keeping excess oil from entering cylinder. They say with right crankcase vac it is better than stem seals in dealing with oil control.
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Motor and Drivetrain / Re: Detonation Detection
« Last post by fabr on November 05, 2019, 06:36:17 PM »

Yellow bullet has ,IMO,the absolute best forum info there is. LOTS of info you will not see anywhere else.

.proper timing and afr can be seen..

Bottom line is that detonation and too rich can be seen as loss of ring seal/loss of crankcase vacuum. Of course none of that info means a thing to those not running vac pumps or 3-4 or more scavenge stage dry sumps.

What got me to looking deeper into this is the old nascar SB2.2 I'm running. It had a 4 stage pump on it and no vac regulator on a sealed engine. No venting at all yet it had zero evidence of any oil leaks anywhere. Got to asking and it seems the engines drive the pump at a speed that at 9300 rpm is just right for the blowby to be perfectly balanced so as to provide around 20" vac.  Cool. Then I ran across this interesting stuff about tuning with crankcase vac readings. I guess it's not really tuning as much as being able to see the engine is happy/not happy with the tune .
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Motor and Drivetrain / Re: Detonation Detection
« Last post by dsrace on November 05, 2019, 03:50:57 PM »
thanks for sharing that !!   i will have to sit down on the computer and re read all of that again. i see those posts are 7 years old but good info. one of the posters said something to the effect of.....proper timing and afr can be seen......so i would like to see that part expanded on.
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Motor and Drivetrain / Re: Detonation Detection
« Last post by fabr on November 04, 2019, 06:46:28 PM »
A lot of these posts have concerned NOS use and tuning but they still apply whether N/A,NOS or boosted.

I never knew any of this and find it really interesting on how to detect tuning induced detonation in short order.

SOOOoooo,here's another.

https://www.yellowbullet.com/forum/showthread.php?t=342893&highlight=FAST+vacuum+sensor
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Motor and Drivetrain / Re: Detonation Detection
« Last post by fabr on November 04, 2019, 06:20:34 PM »
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Motor and Drivetrain / Detonation Detection
« Last post by fabr on November 04, 2019, 05:26:13 PM »
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so we'll need a handheld to talk to you  ;D
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Group Gatherings/Special Events / Re: Lil Sahara Spring trip - 2020 April 26 thru May 3rd
« Last post by Enemy on November 02, 2019, 07:36:05 PM »
Looks like I got me a site booked somewhere down yonder in the dunes there somewhere as well yabetcha shit ya know throw it over the fence to the cattle hay.
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had to go look at the map. looks like 632 or is it  rofl rofl
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