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PostPosted: Mon Nov 19, 2018 6:52 pm 
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Joined: Tue Nov 03, 2009 6:16 pm
Posts: 313
Location: Kannapolis N.C.
I have really enjoyed the times I have worked Runoffs Tech with Sam Neave. May be lucky enough to do it again at VIR if Jim will double my pay.

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Sam Moore
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PostPosted: Mon Nov 19, 2018 7:48 pm 
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Joined: Sat Dec 12, 2009 8:08 am
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Location: Atlanta, Ga
Sam, you're on. I'd have paid you triple. I'll get Sheldon to draw up the contract and get it out to you.

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Jim Creighton
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PostPosted: Thu Nov 22, 2018 7:39 am 
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Joined: Wed Oct 18, 2017 4:33 am
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FP Racer wrote:
Sam, you're on. I'd have paid you triple. I'll get Sheldon to draw up the contract and get it out to you.


Does that mean he gets 3 sandwiches every day for lunch???

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2019 HP winner Hard Charger Award.....I musta done something right


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PostPosted: Thu Nov 22, 2018 4:06 pm 
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Joined: Tue Nov 03, 2009 6:16 pm
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Location: Kannapolis N.C.
The last Runoffs I worked, my lunch tickets were revoked.

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Sam Moore
SCCA competitor since 1983


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PostPosted: Thu Nov 22, 2018 5:08 pm 
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Joined: Tue Aug 20, 2002 2:21 am
Posts: 421
Location: Indian Trail, NC
Cause they said it was an all you can eat buffet. And after a bit they HAD to tell you "that's ALL you can eat!"

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Russ Myers


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PostPosted: Fri Nov 23, 2018 9:32 am 
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Joined: Sat Dec 12, 2009 8:08 am
Posts: 696
Location: Atlanta, Ga
Sam, I forgot that. But, remember at Road American Toni & I had both worked express tech and then regular tech for 12 days and had no race on Saturday and that same person told us we got no lunch that day since we had no race. We went over to Sheboygan and had a nice lunch on our own and let them look for someone else who could run the whistler. Probably the only time I ever saw Kettler angry.

If all it takes is three sandwiches, then your on. And unlike Leguna, you will be able to tell what's in the sandwich.

And seriously, if any of you who might have some extra time especially on qualifying days would like to help, we could use you at tech. There will be lot's of cars to look at and be checked. Unlike other classes, we have made an extra effort to look at all cars for the three production classes. We feel each driver/entrant is entitled to have their time in tech. It's one of the few times where the tech folks looking at your car all have a good background in production. And we really don't bite too hard especially in post qualifying.

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Jim Creighton
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PostPosted: Thu Sep 05, 2019 6:06 am 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1241
Location: Spring Hill, FL.
Just to have a closer look at this ; All of my engines are piston out the top. The Toy engine has a dome plus out the top.
Please show me in your calculation where the dome value is subtracted from the Chamber size on the intake stroke. Clearly if there is a dome on the piston top, there is not air to be compressed in the same space.
I suspect that the whistler is more accurate vs your calculations due to the fact thta the whistler simply measures the actual intake chamber size .
The whistler and the calcs will only agree for an engine with a zero deck, flat top piston.
Until you CC the chamber full down and full up you will not have a valid Compression measurement.
Maybe you do that ,and I missed it. Sorry if I can't read..

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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PostPosted: Thu Sep 05, 2019 9:08 am 
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Joined: Sun Aug 18, 2002 6:52 pm
Posts: 2188
Location: Topeka, Kansas
The way you check a piston that sticks up from the deck is to drop the piston a calculated distance from zero deck and then cc the top of the piston, deduct the bore and stroke that you lowered the piston, and then you have a very accurate measurement of the top of the piston. From there you just check deck height and cc the combustion chamber and you're done. Easy deal. Check this website out for calculating compression if you know the piston's displacement.

https://www.rbracing-rsr.com/compstaticcalc.html

If you don't know the piston's displacement you have to calculate that and Sam Neave did an excellent job of this last year at the runoffs. I personally learned a lot from watching him and have changed the way I calculate compression now.

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PostPosted: Thu Sep 05, 2019 9:21 am 
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Joined: Fri Dec 23, 2011 6:59 am
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Location: Spring Hill, FL.
I looked At that formula. Where does it remove the piston dome cc from the chamber size at BDC?

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PostPosted: Thu Sep 05, 2019 12:14 pm 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1241
Location: Spring Hill, FL.
The above equation does not take into play the space of the piston dome or dish.
Simply states displacement CC + combustion CC/ by combustion CC .
My total chamber size at TDC is 40CC.
Typical VW 1780 CC /4 = 445 + 40cc = 485 divided by 40 = 12.1 Close but leaves out the BDC value of the piston past the deck of 026. A few CC , should be about 6CC.

The equation should be 445- 6 +40=479/40 = 11.9

FWIW I would have to re measure my piston dome volume . My actual guess is around 8+-CC.

The more dome the further off the equation is .

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