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Post by Admin on Dec 18, 2012 12:06:55 GMT -6
Welcome back to The Dirt Forum! ;D
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Post by flipflop on Feb 1, 2013 20:13:53 GMT -6
How much timing is too much?
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Post by leaf4life on Feb 1, 2013 21:05:27 GMT -6
38-40 advanced is about it. I hear of people running 38 ok, but I won't go past 36
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Post by flipflop on Feb 2, 2013 12:17:35 GMT -6
So 47-60 is to much! Are you considering pump gas, compression, engine temp, cam, rod length, coil voltage, ect. Just when does your burn pressure start to move your piston and for how long at 8,000 rpms. I do build my own dist. with more boost. It may take it longer to build up. Tried all aftermarket in last 30 years only to disapointed. Or maybe the heat in the alumium intakes preheating causing it to burn easer and quicker. Its a ballgame!
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Post by flipflop on Feb 17, 2013 12:01:51 GMT -6
Has anyone used a hydrogen cell on a dirt car yet?
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Post by dirtno1 on Feb 28, 2013 20:26:27 GMT -6
What's a good cam to run for 1/3 mile dirt? tried many but haven't been impressed yet.
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Post by leaf4life on Feb 28, 2013 21:29:54 GMT -6
Rpm your running? Emphasis on corner exit ?
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Post by dirtno1 on Feb 28, 2013 22:09:52 GMT -6
6800-7000, yes lookin for harder pull otta the corner. Also have been running a powerglide with stock converter, been reading a lot about tci and thinkin it's something I'm going to do, just gotta figure out to what to do with cam and how to match it to the right converter
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Post by leaf4life on Mar 1, 2013 18:46:44 GMT -6
A good converter will make quite a difference,I'm running a tci fast lap converter with 3000-7000 cam (avg. end run rpm 6900) .530 lift cam. As long as grip is there just yanks the car off the corner, but its still good in the dry too ( might top out at 6500-6700 in dry)
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Post by flipflopoo1oo on Mar 6, 2014 11:12:07 GMT -6
Dialing in a cam if perfect can be a chore as to temps, load, fuels and compressions as well as exhaust tune! We have turned 6800 off the corner or 6400 at the end going in with out spinning a tire either way as per gears with the same engine and cam to win legally! I re-degree to keep the pulling range in the peak of my ratios! This was a hydraulic cam with a 450 lift rule! Solid lifts are easier to deal with as to changing valve lash and geometry issues! Going lean using a power valve in your carb, compressions and fuels and temps all can cause it to stop pulling! Its hard to keep the vacuum for torque and turn up too! Never had use of a Dyno other than a driver and a trophy! Even the best parts can't make horse-power unless in design of tune! I have ran a 713 total lift,( with geometry) roller to turn 8300 with all the goodies on a .066 350 Alcohol engine and went down to a 526 gear to turn less only to be faster and still pull the left wheel old school! No room to re-degree that beast! Exhaust closing number is key to degree so cam must degree backwards at the valve and designed so per application! Most engine builders don't even want to talk to me! Horse power is my closest friend I have!
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Post by flipflopoo1oo on Mar 6, 2014 11:44:37 GMT -6
What is the craziest thing you ever did to a engine just to make a race! Like weld a main cap on, or my favorite is using Blue fuel line hoses and zip-ties as guide plates on roller rockers to hold them in line! It ran the whole season that way! We did replace zip-ties once, just in case! Have too, works sometimes! Tech is always fun after winning stupidly! Did you know that when dropping the pan during tech, some would of had us poor boys disqualified except no one had issued a claim!
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Post by flipflopoo1oo on Mar 10, 2014 14:36:05 GMT -6
What is the coolest you ever got .066 350 engine to run and how? Archives has some good tips but yet none found here! Additives, restrictors, pressures, fans, water pump tricks, reductions, extra fuel, timing matching octanes, extra porting of head gasket cooling holes, radiators, shrouds lower compression or reducing friction to gain horses??? I use them all to get down 147 degrees!
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Post by flipflopoo1oo on Mar 12, 2014 12:14:33 GMT -6
Ever have more horse power and torque than you can use by the rules? Variations in this is a important part to just moving it around a bit or limiting it for a bit! 300 horses in the turn with gears can move most cars efficiently to handle the rest in a progressive manner on a dry slick track. But as all tracks are not slick or change during the race, having it pre-set can be a problem. Would you rather have it on the floor or have to baby it off the corner? Jetting and timing changing can solve a lot of traction problems if happy with your set-up otherwise! It is worth the effort it takes to do this! A few degrees or air filter net is easy! Reading a plug by oil on the threads on your leanest cylinder NO. (3 on a Chevy 350)! Keeping 3 wet ones with oil assures performance and safe cylinder burn temps!
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Post by Krooser on Mar 16, 2014 17:55:32 GMT -6
6800-7000, yes lookin for harder pull otta the corner. Also have been running a powerglide with stock converter, been reading a lot about tci and thinkin it's something I'm going to do, just gotta figure out to what to do with cam and how to match it to the right converter The best thing you can do is talk to a cam grinder who can grind what you need not sell you an out of the box grind…. Jones, Bullet or Camcraft... |
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Post by flipflopoo1oo on Mar 27, 2014 18:12:29 GMT -6
I never have had a custom cam ground! Just getting one I liked was hard enough and then getting the geometry correct per cylinder with core shift is a real pain only to find out flow per cylinder was off and have to start all over! Push rod length only goes so far as to correcting things with hydraulic cams while lash does have it's good side with solids! Asymmetric is a intake side install and leaves me out on a limb as I think more about exhaust closing and overlap! Those sudden close cams are to fast to keep up with! Center lines are off-set and a trial and err run is best at one degree as to the design from being correct on one side only! A good cam if correctly placed! Gives more room in duration and less overlap with more room to degree but most sensitive to degree changes with the faster closing ramps! You better have good springs if used but not too good as to shear of keepers is more prevalent!
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