entropy
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posted December 27, 2004 05:41 AM
ColdCrankingPsi: WHOA!
Before firing up my new motor, JohnnyCheese did his SOP compression check on a couple of cylinders; 280psi or so. He then did 4 heat cycles, then 20 dyno pulls to tune the new set up.
Yesterday I pulled all 4 plugs (fukken monocoque frame!!!) and took readings; WOT, freshly charged 24v starting system, 50F in my garage.
I got a very consistent 290-295psi... YIKES! 
I'd be worried at this level, but Cheese measured/clayed all critical clearances; they are solid.
hmmmmmm... any guesses how long this motor will stay together???
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junior s
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posted December 27, 2004 06:15 AM
As long as you are on good fuel and no detonation problems and the planets stay aligned juuust right , should be good for long time 
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entropy
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posted December 27, 2004 06:26 AM
junior:
this is the fuel I'm using:
VP-C44
Produces significantly more HP and torque over all other nonoxygenated fuels. Impressive results in normally aspirated engines with CRs from 9:1 to 17:1 in drag race and oval track qualifying applications.
Color: Purple
Motor Octane: 99
Specific Gravity: .676 at 60° F
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osti33
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posted December 27, 2004 07:51 AM
 Edited By: osti33 on 27 Dec 2004 07:51
quote:
I got a very consistent 290-295psi... YIKES!
GAWD!!! That is very impressive!
That thing is going to be a beast!
Way to go Entropy and Cheeseman.
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entropy
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posted December 27, 2004 07:59 AM
Ry,
Yep, that Cheese ROCKS!
Today i'll put it back together; jeezuz, take the damn radiator off just to do a compression test? My hands are too big to do it otherwise; i tried. Sometimes I wish I had a Busa... 
Tomorrow, i will replace the oil pump. Some Boozer guys, say always replace the oil pump when you have a bearing failure. Seems like overkill, but I am NOT taking any chances.
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TurboBlew
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posted December 27, 2004 08:46 AM
Lucky you got that 24v system....lol
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MadMike
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posted December 27, 2004 08:58 AM
Holy cow man!!! That thing is Crazy!!! I can not wait to see your MPH!!!! go man go....
I can not wait to see how she runs...
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zrxdean
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posted December 27, 2004 09:34 AM
Wow, that thing must sound excellent. Email me video with sound please...
I'm not doubting, but edumacate me : how is it that 99 octane fuel is safe for up to 17:1? I thought folks were using C-16 or the like when compression gets this high.
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entropy
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posted December 27, 2004 11:18 AM
that fuel info is straight from VP's site, and I have talked with them several times. I HOPE they are not "misspeaking" themselves.
VP is very into drag racing fuels, so i 'm trusting them...
What is really cool is the exhaust pressure coming out the can at idle.
track opens on Jan 8, hope the weather cooperates.
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dougmeyer
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posted January 05, 2005 07:57 AM
YEAH baby, now your cookin' I might be thinkin' along the lines of C-25, though.
What's the calculated ratio?
Doug
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entropy
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posted January 05, 2005 09:03 AM
Edited By: entropy on 5 Jan 2005 11:08
Doug,
With the motor on the bench, JohnnyCheese cc'd 2 cyl thru the plug holes and calculated 15.1:1 and 15.6:1; so i'm calling it 15.4:1.
When JC saw those numbers he took it upon himself to clay the cc and got .044" on quench and plenty (i don't have the numbers) of clearance on valves at 107/110.
The VP guy swears that C44 is the tits for this CR. What do you think?
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psycho1122
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posted January 05, 2005 09:21 AM
How were you able to get that much CR and have a "Roomy" .044 in the quench area?
I have 245 psi a hole(cold) w/ my 1270. Quench is .027!! Piston to Valve is .050 , Cams at 105/100.
Runs like STINK though!! 100 ft. lbs. by 4,700! Max ft. lbs. 111
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psycho1122
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posted January 05, 2005 09:25 AM
Oh Yea.....Runs on 91 pump gas. HOW?! Good map done on the MJP dyno. A/F is 12.8-1 through the FAT middle and closer to 13-1 up top.
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entropy
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posted January 05, 2005 11:06 AM
quote:
How were you able to get that much CR and have a "Roomy" .044 in the quench area?
I have 245 psi a hole(cold) w/ my 1270. Quench is .027!! Piston to Valve is .050 , Cams at 105/100.
Runs like STINK though!! 100 ft. lbs. by 4,700! Max ft. lbs. 111
holy schitt!!!! Q = .027"!!! do you try to stay away from the limiter???
have you measured yr CR???,
my 3 pt graph would est 14.3:1 or so.
100ft# by 4700 is more than i have there; wow!!!
BTW, i get comfy dimensions and hi CR with custom JE 87mm pistons.
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psycho1122
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posted January 05, 2005 05:29 PM
YEP! Shift light set at 11,000
No measure on the CR yet..........
I would not be surprised w/ a 14.3-1 CR though
How about 97 ft. lbs. by 3,800??
H.P. tops out on this engine at 190@ 10,000 rpm. (Trade off for TQ!)
I hate to say this.....BUT.....Did we build a Eye Abusa engine??!!??
PLEASE SAY NO!
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psycho1122
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posted January 05, 2005 05:40 PM
BTW...Nice Pistons!
When we "Re-Did" the engine (after the 3rd. gear failure) we noticed that the 1270 Muzzy kit was just close enough to the head to show a "shiny" no carbon zone in the quench area between the Intake valves (no base gasket of course ). Sooooo.....we did a little massage in that area to give us some room  .
Did some dragracing and a few trackdays.....Seems happy after 4,000+ miles now. Still maintains good oil pressure (42 psi at 4,000 rpm on the road cruzin' top gear)
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rac4it
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Bergie
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posted January 05, 2005 07:33 PM
I've been hearing (reading...) a lot about VP C44 recently. Have you done a solid comparison vs. MR9 for N/A hp gains? Same price as MR9?
Might be a good alternative special purpose fuel for naturally aspirated LSR classes.
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entropy
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posted January 06, 2005 01:26 AM
i've never used MR9.
i used to always run Nutec until I torched a motor doing standing mi running it; the signs of detonation were pretty clear. That's when JC started routinely doing CR measurement for me, and that's when i started running C44.
Its more expensive than Nutec, but hell, I don't burn that much of it.
I would guess that it would be perfect for NA LSR.
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psycho1122
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posted January 06, 2005 07:33 AM
Ya Know entropy....Having a "tight" quench area HELPS minimize the possibility of detonation.
Granted I don't run over 15-1 CR! But I still run 91 pump at over 14-1
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entropy
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posted January 06, 2005 10:26 AM
i didn't know that tight Q inhibits detonation; maybe i oughta take another .010" off the quench, take CR up to 15.8???
ummmmmm.... I can't do that yet, my compression guage only goes up to 300psi
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