needmore poneys
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needmore poneys
heres what i got 71-429 speed pro scj forged pistons , dove heads ported , stealth int , comp 292-h cam, 825 race demon carb , roller rockers-1.7 , 8 - 2in pipes about 30 inches long no collectors, msd ign , blaster coil , 200 shot of nos. brad said this motor should make 581 hp at 6500 rpm without juise . i dont realy think it is but maybe its not tuned rite. hers what i want i have a 2500 pound mud buggy with 410 gears 38 in cut boggersneed to get under 4 seconds through 200 feet of mud rite now i am at 5 seconds i dont want to buy all new parts to make more power but might change crank or heads or ad more juise how much more hp could be got buy changing to 460 crank? and how much juise do you think this motor can take,
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what you need is to brush up on speling and gramar and learn how to use periods because they help you end a sentence and its easier to read and understand what your saying when its easier to read because you used periods to seperate everything that you were writing about your truck that is not performing the way you want it to perform
Dude, slow down. Take a deep breath and relax. DD gave an estimate of 581 hp for your combo. DD also presumes that you have all the necessary skills to properly assemble and tune your mill. Have you actually dynoed your combo or are you using the SOTP method? Even with good parts, bolting everything up without some pre-build prep or post-build tune will usually result in a poorly performing engine.
You have plenty of engine. What you need to do is take some time and learn how to dial in your combo.
Brad
Dude, slow down. Take a deep breath and relax. DD gave an estimate of 581 hp for your combo. DD also presumes that you have all the necessary skills to properly assemble and tune your mill. Have you actually dynoed your combo or are you using the SOTP method? Even with good parts, bolting everything up without some pre-build prep or post-build tune will usually result in a poorly performing engine.
You have plenty of engine. What you need to do is take some time and learn how to dial in your combo.
Brad
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brad thanks for the gramer lesson , howevert i dont think it will help me . as far as i know my motor was assembled rite and tuned to the best of my knowlege . motor runs good ,timing is at 36 deg , plugs are nicelite tan color,revs 6000 like nothing with no missing or hesitation,what else is thier ? . know were i can find tips on tuning race engines?. what about the 460 crank with this engine? thanks for the help. see i told you it wouldnt help
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Just swapping in a 460 crank won't help. At the very least it will probably push the pistons into the valves (or worse) as there is a difference in the compression height of the 460 piston vs 429.
Using your setup with a 200 shot of nitrous you should have plenty of go, especially with only 2500 lbs for it to lug around. A full second increas in your pit times is a lot. If nothing else changes, you'll have to have a serious - and very expensive - HP increase to make up that kind of time.
Just to put it in perspective, an 02 Camaro weighs about 3500 lbs with fuel and a driver and is advertised at 335 HP (which has been documented at more like 350). This comes out to about 10 lbs/HP and will propel the Camaro to low 13 / high 12 second sea-level quarters at around 105-108 MPH. Your 2500lb rig with your engine setup and a 200 shot of liquid horsepower should be coming in somewhere around 4-5 lbs/HP. That's Suzuki Hayabusa territory! You should be jumping over the pit like a caffein-crazed flea. Something, somewhere, is not right if you are just getting fair-to-good performance from your buggy.
Brad
Using your setup with a 200 shot of nitrous you should have plenty of go, especially with only 2500 lbs for it to lug around. A full second increas in your pit times is a lot. If nothing else changes, you'll have to have a serious - and very expensive - HP increase to make up that kind of time.
Just to put it in perspective, an 02 Camaro weighs about 3500 lbs with fuel and a driver and is advertised at 335 HP (which has been documented at more like 350). This comes out to about 10 lbs/HP and will propel the Camaro to low 13 / high 12 second sea-level quarters at around 105-108 MPH. Your 2500lb rig with your engine setup and a 200 shot of liquid horsepower should be coming in somewhere around 4-5 lbs/HP. That's Suzuki Hayabusa territory! You should be jumping over the pit like a caffein-crazed flea. Something, somewhere, is not right if you are just getting fair-to-good performance from your buggy.
Brad
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From: connecticut
Did you degree your cam? You may want to discuss this with comp (if you havent already) they are known to be very helpful. Some dyno time would probably find quite a bit of power too. I suggest refining your current engine before changing expensive parts.
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no i didnt degree cam, comp tech line said to instal it strait up and it would be good . looks like i will be going to the dyno this winter to try and get this motor to perform like i expected it should, another 1000 bucks , hopfully it will help, because i sure am not impresed with this rite now . were do you think cam should be? heres the specs 560-560 lift , dur @.006 tappet lift 292-292, valve timing @.006 int 40 btdc open -72abdc close..
exh 80 bbdc open- 32atdc close
these specs are for cam instaled at 106 intake center line
dur @50244-244 lobe sep110
exh 80 bbdc open- 32atdc close
these specs are for cam instaled at 106 intake center line
dur @50244-244 lobe sep110
Posting Guru
Joined: Jun 1999
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From: Everett, Wa
Well I'm no expert but I wonder if you don't need more gear. It seems to me that 4.10 is a little small with 38's. Your engine should be making plenty of power its just a matter of getting it to the ground. Maybe 5.13's or something. But don't take my word for it, I'm not a mud racer.
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dont think gearing is my problem 410 gears 38 inch tires and 2.1 transfercase in low should be lots of gear, you got me thinking about the cam , i wonder if i have got it rite instaled strait up maybe it should be 4 deg adv ,?
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From: connecticut
i play more with SBCs and circle tracks. We adjust the cam timing to alter the power curve of the engine. WHen the weather is cool (spring and fall) we advance the cam to 98.5. In the hot summer when the track is 'greasy" we retard the cam about 1.5-2 degrees. I am not too familiar with the type of racing you participate in and where on the track you are losing time. If nothing else, i would check the cam timing with a degree wheel, etc, before changing it. Also, is your distributor advance locked? If not, its a good idea.
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From: Eastern Ohio
I would maybe also look at shift points, and also try a bit more on tuning on the motor. The combo sounds good, even without the juice, but if its not turning on straight off the line, youre going to have problems. Example, today my 1990 F250 Ex cab LB (Approx 6000-6500Lbs) with a 429, TF heads, Comp 4x4Extreme cam, 11.25 KB pistons, and c6 with 3.55's and 35" radials turned a 5.22 in a 200ft pit. This was with the IFS lifting the tires in on the front, 35lbs of air in the tires and the throttle backed out 1/8 of the way by the stop (which short-shifted the trans also cause the kickdown wasnt holding it in longer. You have less weight, and better gears even with the bigger tires. I would really look at where the shift points are at as well as do some more tuning, as that should run 4's without much trouble at all.
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i manualy shift it at 6000 rpm kick down and modulator are disconected. i am looking towards carb now to i put it on rite out of box, i have been told it is jetted for sea level and i am about 2800 ft maybe to fat ?. also i am still looking for spark plug recomendations , i only run about 7 or 8 lbs air in my tires
Last edited by tess100; Jul 28, 2004 at 11:49 PM.
Tuned
Joined: May 2003
Posts: 345
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From: Southern IL
I run nothing but 460's. If your carb is properly adjusted, and it sounds like it is, your only problem is most likely gears. You have all the power you need and personally, I think it would be a waste of your money to try anything else with the engine. Stop looking at the power plant for solutions and think about other ways that would increase your speed...
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