the 74219 Lingenfelter cam was recommended to me. Then again, I want my car to pass California emissions.
SuperRam 383 Owners...Step Inside
Thread Starter
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
SuperRam 383 Owners...Step Inside
Ok, I am looking for the combo with the flattest and longest torque curve. Let me know what you got and see the real world dyno graphs if you have them too.
The intake is really throwing some iffy's into my calculation and I want to know what some of you guys running the superram are getting.
TIA and I look forward to it!
The intake is really throwing some iffy's into my calculation and I want to know what some of you guys running the superram are getting.
TIA and I look forward to it!
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
The 219 cam and SR combo is a proven design for huge torq numbers. The only other cam that makes similar low end and mid range torq is the 211 cam. Another choice would be something in the 224 numbers but not much larger as then the numbers go higher in the RPM range.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by k0rv3tt389
So... How does the 383 cube/219 cam/SRI setup look on the dyno? What is better for that setup, a 5.7" rod or a 6" rod?
Last edited by tjwong; Sep 28, 2005 at 10:54 AM.
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Now, I see that rod/stroke ratio has to do with everything if I would put some money down to build a 383? I hear people saying they'd like the longer rod for higher rpm revving capability as it doesn't put as much pressure on the cylinder wall like a shorter rod does. Same goes with Hondas as a DOHC 1.6L B16A from a 99-00 Si can withstand 10,000 rpms on the stock bottom end, if the valvesprings on the head allow. A rod/ratio of 1.75 is considered a perfect compromise without sacrificing power and revabilty. I see some motor builders would like a longer rod for hp/top end as would a builder preferring a shorter rod for the street or torque/bottom end power.
Looks like a 383 with a 6" rod has a rod ratio of 1.6 so that sounds a lot better than I have originally thought.
Looks like a 383 with a 6" rod has a rod ratio of 1.6 so that sounds a lot better than I have originally thought.
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Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
The cylinder head size plays a large part in the equation as well. I like the velocity of a 195 runner for a 383 SR combo, as Tom mentioned with corvette0096's car.....that thing is a beast! I wish there had been a larger choice for my engine with it's greater displacement, but I wanted to stay EO compliant
Thread Starter
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
Vader, cool I had forgotten about that I will go grab my copy. I do however want to see it with different cylinder heads too, especially AFR 195 comps and streets since they are similar to my heads, but also all heads, just for the sake of how cabo mentioned the variability of heads and others.
Instructor
Joined: Mar 2004
Posts: 139
Likes: 5
From: Cleveland oh
rod length
a 5.850 rod keeps the piston a bit taller and a groove lock spacer isn't necessary in the oil ring groove. some people like that, others don't have any issue with it. a "6 inch rod 350" piston has a 1.260 compression height (Pro Tru), which would be zero deck at 8.985 with the 5.850 rod. It also keeps the lands pretty thick if you wanted to go with nitrous.
Race Director
Joined: Aug 2000
Posts: 11,506
Likes: 4
From: Vancouver,Wa.
I will tell you right now how I feel about dyno numbers.. Take them with a grain of salt. The track numbers don't lie. Best times in my sig.. I pass emissions with flying colors. Load limit is 220PPM and I get 34 PPM at idle the limit is 150 and I am at 23PPM. This is just with a cat on. Now the new cam that i will put in over the winter will be a little more aggresive. 
I want this thing to be in the 11.5 range in the heat of the summer and 11.1-2 range in the good air.
I want this thing to be in the 11.5 range in the heat of the summer and 11.1-2 range in the good air.
Thread Starter
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
Corvette0096, I agree, the dyno numbers don't mean anything, however I do pay attention to the shape of the torqye curve and I can definitly feel the shape of that curve with my current set-up (not flat) thats all I want the dyno graphs for.