SCR and DCR on 408/L92 setup
02-06-2007, 03:02 PM
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SCR and DCR on 408/L92 setup could someone figure out the SCR and DCR for my new setup for me...
Lunati 408 with -13cc dish pistons
L92 heads milled .030
cosmetic .040 gaskets 4.060
244/248 612/615 112+2
12 BTDC 52 ABDC
58 BBDC 10 ATDC
.006 INT 293 EXT 297
.3600 INT .3620 EXT
110 ICL
all specs off my cam card thta im stuck using for now
Lunati 408 with -13cc dish pistons
L92 heads milled .030
cosmetic .040 gaskets 4.060
244/248 612/615 112+2
12 BTDC 52 ABDC
58 BBDC 10 ATDC
.006 INT 293 EXT 297
.3600 INT .3620 EXT
110 ICL
all specs off my cam card thta im stuck using for now
02-06-2007, 03:45 PM
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Originally Posted by Quik
ouch!!! thats low
let me guess the -13cc is hurting the SCR?
and that cam isnt helping either?
let me guess the -13cc is hurting the SCR?
and that cam isnt helping either?
It ain't helping... I'm running the same piston in my C5's 408. My chambers are 62cc giving me around 11.3 SCR.
02-06-2007, 03:55 PM
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Originally Posted by 2c5s
It ain't helping... I'm running the same piston in my C5's 408. My chambers are 62cc giving me around 11.3 SCR.
what causing such low DCR then?
02-06-2007, 04:00 PM
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Originally Posted by Quik
well i think a L92 is what 70cc? .030 is what around 67cc? and .040 is now around 64cc? so yea i can see 10.9
what causing such low DCR then?
what causing such low DCR then?
I was going by a 65cc chamber and .008 OTH. At 67cc, you're at 10.6/7.7
02-06-2007, 04:05 PM
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Originally Posted by 2c5s
I was going by a 65cc chamber and .008 OTH. At 67cc, you're at 10.6/7.7
what is causing the DCR so low
could advancing the cam anymore help at all?
seems like with this cam this will be a total dog down low
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02-06-2007, 04:23 PM
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Originally Posted by Quik
i think your right. whats the CC off for every .010 off?
what is causing the DCR so low
could advancing the cam anymore help at all?
seems like with this cam this will be a total dog down low
what is causing the DCR so low
could advancing the cam anymore help at all?
seems like with this cam this will be a total dog down low
02-06-2007, 05:01 PM
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Originally Posted by 2c5s
Your DCR is low because you already have a low SCR to start with. Putting in a bigger cam makes it worse. Is this engine built and running? Yes it will bring it up.
my first goal was 11.5 scr but since the -13cc they say i cant acheive that. i even went with the .040 gasket to help out
cam is in but i can pull it out and advance it some if needed to...what do you think +2*...what would that do for the power band and the RPM range along with the DCR
02-06-2007, 05:01 PM
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Originally Posted by Stang's Bane
Why this cam? Just asking. Why not sell it to someone building a regular 408 and get a l92 spec cam?
if i could sell it, it would be gone tomorrow
02-06-2007, 05:13 PM
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now im curious to my old motor with the Trex in it
its a 03 LQ9 with 243 heads stock MLS gasket
Trex cam
what is the DCR on that...i believe the SCR is 11.1
its a 03 LQ9 with 243 heads stock MLS gasket
Trex cam
what is the DCR on that...i believe the SCR is 11.1
02-06-2007, 05:38 PM
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Maybe change cam or advance it more, but I guess you will start messing with your overlap timing and evc etc. You should probably talk to someone who knows what they are talking about camwise 
02-06-2007, 05:44 PM
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while with those low numbers...i doubt ill make hte power im looking to get. i need as much lowend as possible...this needs to me a more effeicent setup
any ideas????? cam is expandable, heads im comitted to, i cant take more off and head gaskets are comiitted to...so only leaves the cam
since motor is comitted to also
any ideas????? cam is expandable, heads im comitted to, i cant take more off and head gaskets are comiitted to...so only leaves the cam
since motor is comitted to also
02-06-2007, 07:21 PM
#17
Originally Posted by Quik
thanks buti dont have acceel
The -13cc dished pistons really put a hurt on SCR and DCR.
02-06-2007, 07:30 PM
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Originally Posted by Bink
Sign up with "Google Docs & Spreadsheets" and they have Excel-like spreadsheets you can use and save online. I used it at work for the DCR . Here's a link to sign up -> https://www.google.com/accounts/Serv...tm_medium=more
The -13cc dished pistons really put a hurt on SCR and DCR.
The -13cc dished pistons really put a hurt on SCR and DCR.
Engine Assembly Engine Kit For LS1 Includes 4 in. Pro Series Crank. 6.125 in. Pro Billet Connecting Rods. 4.030 Bore –13 cc Rev. Dome Pistons With Rings. King Main And Rod Bearings.
Engine Assembly Engine Kit For LS1 Includes 4 in. Pro Series Crank. 6.125 in. Pro Billet Connecting Rods. 4.030 Bore –13 cc Rev. Dome Pistons With Rings.
Installation Notes
Must Use Chamfered Bearings! Kit Can Must Be Used With 6.0L Truck Block Or C5–R Block. Lunati Recommends To Always Stretch Rod Bolts Using ARP Lube. Note: All Calculated Specs Were Figured Using A .008" Out of Deck, 9.240" Block Height, And 67cc Cylinder Heads. (Stretch Gauge P/N 98401)
Features
4340 Forged Steel Crank
All Rod Pins Drilled To Reduce Rotating Mass
Gun Drilled Mains
4340E Billet Rods
10.6:1 Forged Pistons
Plasma Moly File Fit Rings
Great For Hot Street And Strip
Assemblies Come Balanced And Ready For Installation
Limited Warranty
02-06-2007, 07:41 PM
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with what they said.....i figured a L92 head has a 69.8cc and milling them .030 and then using a .040 gasket is .050 off a 69.8cc head...shouldnt that be around a 63cc then?
i spun this motor over by hand with just one head on and on the compression stroke it gets somewhat resistant compared to others motors i spun over... i spun over a 11.1 6.0 and it wasnt as resistant as this 408 is.....which makes me think i should be higher then 10.8
especially since a 67cc head which they claim is 10.6
i spun this motor over by hand with just one head on and on the compression stroke it gets somewhat resistant compared to others motors i spun over... i spun over a 11.1 6.0 and it wasnt as resistant as this 408 is.....which makes me think i should be higher then 10.8
especially since a 67cc head which they claim is 10.6
02-06-2007, 07:46 PM
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Originally Posted by Quik
which that sucks cause there was only 2 options the -13cc which lunati claims with a 67cc head it will be at 10.6 scr and the other option was -38cc for boost
It is 10.6 with a .04 gasket.