Landracing Forum
Tech Information => Technical Discussion => Topic started by: Racerboy on October 30, 2008, 01:25:01 AM
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I am building several SBC C fuel motors for next year all running on alky no nitro and I would like some ideas on what camshaft to run. I like roller cams but I will entertain any idea's. I don't want to run a lot of RPM. I am thinking about somewhere around 7200 to 7800 RPM. Please chime in.
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I don't want to run a lot of RPM. I am thinking about somewhere around 7200 to 7800 RPM.
Any particular reason? An SBC with a roller cam can turn 10,000.
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I am guessing you are asking what grind and not for a manufacturer. I would call Isky or any big name and tell them what you are wanting. For 7800 rpm probably a few choices on the shelf. Just my opinion If I wanted to turn 7800 rpm tops I would build a big block. Also I could check with my builder on our grind but its a dog below 5500-6000
Later Rocket
10000 rpm +++++
I think the plus must be for plus a lot of broken parts! sure is fun though!
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You can't make a C motor (370 cid) with a big block can you ,I don't think they make sleeves that small or that short of a stroke crank. I have a lot of small block parts from my supermodifieds but I want to install a good profile camshaft that is more suitable for LSR
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You need to give more information to get a real cam recommendation. What bore, stroke, rod, compression ratio, head flow numbers, etc.......
What kind of car? Frontal area?
You can just look in any cam makers catalog and find a cam that will run to 8000 no problem and get 90% of the horsepower the motor is capable of making.
Its that last 10% or 5% that you really have to work for.
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4-7 swap :-D
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There have been a ton of big blocks running as "C's" but not with "stock" parts. Like what is said above you need to figure out what you are wanting to do. Straight methanol in a nitro class normally won't have much of a chance. Whether you know or not GM did have a 366 cu in Mark IV engine; it was used in trucks....................Good Luck
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The problem is that all 366 (3.935" × 3.76") engines are tall (10.20") blocks. Assuming a fairly common 1.50" compression distance for stability and ring seal, a 6.82" rod is need for zero deck. Of course, the 366 heads really aren't suitable.
There will also be some valve shrouding, perhaps some notching will improve it, IDK how much?
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There are some 3.1 stroke BBC cranks out there that make wicked 360+CI Cs---BUT they need good Spread port heads to get any compression---I would go with the later SBC 6.0 truck engs---the 6.2 GM stock heads that will flow over 330 stock and 375 plus with some porting ----but why build any SBC you are not going to spin over 9000 :?---there are folks out there thinking and planning about 9000+ RPM from 500+ CI BBCs :-D
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There are some 3.1 stroke BBC cranks out there that make wicked 360+CI Cs---BUT they need good Spread port heads to get any compression---I would go with the later SBC 6.0 truck engs---the 6.2 GM stock heads that will flow over 330 stock and 375 plus with some porting ----but why build any SBC you are not going to spin over 9000 :?---there are folks out there thinking and planning about 9000+ RPM from 500+ CI BBCs :-D
Any more info? Every time i do a search on Google i get hits for info about turning a blistering 6500 rpm's! Building a boat with a 302 sbc (could change) and would like any info specifically about higher rpm operation.
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I was refering to LSR engs.---HOT boat engs are a lot like LSR engs need lots of top end power for much longer than the drag strip.
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I hope your not planning on putting that C/F engine in a roadster. :-P
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After the last race I would change classes if I had a roadster. 249 on the first pass. Hold on when they get that thing to run.
I am building a comp coupe
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ill tell ya right now..... ya cant get the MPH without the RPM...
kent
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My 360 makes 760 hp at 7800 now with the sprint car cam in it . I am sure we can get the job done with some tuning. I can always spin it faster but I dont think we will have to. I have my 410 making 890 hp at 7900
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ill tell ya right now..... ya cant get the MPH without the RPM...
I would say 100% true
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I agree I am turning my BBC what he is the 410.----I need "mo Better" heads I am not making much more power with a 555
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ill tell ya right now..... ya cant get the MPH without the RPM...
I would say 100% true
I think it depends, we ran our 253 at about 6800 with our roots blown motor and I think most turbo cars aren't going to be real high rpm cars. Now NA is a different story and there I would build a motor like you guys are talking about,
Sum
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ill tell ya right now..... ya cant get the MPH without the RPM...
kent
If you run that funny smelling yellow stuff you can. :-o :-o :-o :-o
Tom G.
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Alans 249 mph was at around 5800 rpm. :-P
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Desoto is right!!!! the more the yellow stuff the lower the RPM.. Chauvin went over 300 in his front engine modified under 5000 RPM. The key is the compression and a BIG SPARK.............JD