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  1. sbc438

    Effects on torque reading

    Assuming the torque wrench is 1 (A2) ft and the extension is .25 ft (A1= 1.25) my torque wrench is going to read 64.5 lb-ft? Now since this is ArmLength dependent...what if the operator chokes up on the torque wrench and A1 is .75 feet in stead of 1 foot A1/A2 goes from 5/4 to 4/3 changing my...
  2. sbc438

    Effects on torque reading

    OK here's the delema. I have to develop a torque wrench extension to reach a bolt under a verical. What I have come up with is a box end extending horizontal for 3 inches and then 90 degrees down for 6 inches to the torque wrench. My problem is what will the reading on the wrench be @ 51.6 lb...
  3. sbc438

    modifying intake manifold, how high should it be

    One thing to keep in mind. Other engine components need to be up readed. Just had a 6.1L hemi come through the shop that had head work done and a procharger. The result...the rods were in a hundered peices. This wasn't even a real agressive tune-up but the factory rods were way too weak.
  4. sbc438

    Ignition timing for Methanol vs Gasoline

    Unfortunatly I don't see a cannned answer for this one. So many things are nvolved as I'm sure you know (cam timing, ignition timing, piston geometry, chamber geometry, ect). If it were me I'd recurve the timing to a safe point and add some fuel just in case. Then creep back up on the...
  5. sbc438

    Ignition timing for Methanol vs Gasoline

    How do the rod bearings look? If the chamfer on the bottom bearing half 180 out from the rod beam is being hammered out you are experiencing detonation for sure. Any ring issues? Look for missing chromoly on the top ring this also indicates detonation. From your coment on the ground straps...
  6. sbc438

    Ignition timing for Methanol vs Gasoline

    Brobards, There are many things that can be causing this issue. More likely than not you are pushing the gasket out then burning it or the head. We run a traditional Chrysler Wedge motor 526 ci on methonal @ 37psi from a roots blower. Our timing is 32 degrees advanced with 10:1 static...
  7. sbc438

    Tire diameter as part of overall gear ratio

    Wrapspeed, From experience in drag racing most bracket choose the smallest tire they can get away with and still hook up. This reduces rotating mass which has some advantage. At this lever most use minor size differences to fine tune their engine rpm when the gaps are too large between rear...
  8. sbc438

    individual runner vs. common plenum intake

    Is anyone familar with the pros and cons of the two differnt intake designs pertaining to V-8 engines in a high performance arena. Logic would suggest that an individual runner system like a webber set-up would create more low end power through maintaining velocity. Once you reach a...
  9. sbc438

    Engine Loading ?????

    I have to disagree with you on that. Having had several discussions with Clay Millican (IHRA TOP FUEL Champion) in person, they do hurt parts when things go right!!!!! On a typical run they replace every rod, piston, ring, and 2-4 cylinder liners if things go right. When things go bad they...
  10. sbc438

    Engine Loading ?????

    It seems possible that one contributing factor can be higher load won't let the engine accelerate as fast thus decreasing the mean RPM over the run in effect increcing the time avalible to burn the A/F mixture. We do compensate for this with ignition timing by advancing the ignition to start...
  11. sbc438

    Engine Loading ?????

    Ccycle, My referance to engine speeds wasto "loosely" describe how we accelerate throught the 1/4 mile. To clearify our launch rpm is 2K the go WOT and accelerate to 87000rpm where we shift to second gear and that pulls the engine speed down to 6200rpm and we accelerate from there to around...
  12. sbc438

    Engine Loading ?????

    In what we're doing feedback systems that also control "anything" on the engine are not allowed. So we use the known pump curve and flows of injectors (just a atomizing nozzel) along with RPM to match the fuel needs to the load. Tuneing is done by bypassing fuel and releving pressure with...
  13. sbc438

    Engine Loading ?????

    We run a posative pressure injection system where the pump pressure is variable with engine rpm. The main controling parts of the system are the barrel valve activated buy throttle position, main bypass jet (used to richen or lean mixtures) and a high speed lean out in the form of a pressure...
  14. sbc438

    Engine Loading ?????

    Ivymike, It's been 8+ years since I took my last Physics class but I wasn't trying to be exact in terminology. When it's all said and done this system must follow the laws of physics and conservation of energy. With all things constant (gearing, fuel tune-up, tire size, weight, .....) when...
  15. sbc438

    Engine Loading ?????

    The best way to describe the way it works is kind of like a battery. Let's say you have a battery with 900 amps avalible, if you wire in a 100W light bulb you will only pull 8.3 amps. Now if you dead short the battery you will pull all 900 amps. The amount of power released is directly...
  16. sbc438

    Engine Loading ?????

    OK, I've been crewing on an IHRA Top Dragster foe a year now. I'm a degreeded Mechanical Engineer but I'm having trouble getting my head around one concept that keeps coming up!!!! Our engine is a 528 ci Blown Alcohal Chrysler (appx 1950hp). The one thing that keeps poping up is engine...
  17. sbc438

    High response solenoid valves?????

    I'm looking for a valve response of 1 msec taking into acount that the system will be slower. The cylinder was listed as a system componant to give an idea of flow needed through the valve. I was thinking a large dia popet style valve with an extreamly short through would improve response...
  18. sbc438

    High response solenoid valves?????

    I have a unique application for a high repsonse solenoid valve. I'm using it to open the throttle on a race car. in this application there are two critical things. 1) response time 2) flow. Can anyone point me in the right direction of a high response high flow valve??? Here are my system...
  19. sbc438

    Methanol combustion formula

    You are correct in your theories but we actually run rich to protect the engine from meltdown.... If the air gets worse we can lean out to compensate for the power loss and or add timing. It's a ballancing act that has really bad consequences if you go lean or add too much timing. FYI Last...
  20. sbc438

    Methanol combustion formula

    One more quick one. Gaseous water, does it adhear to the perfect gas law? Thanks for the input!!! As you ignored the O2 in Alcohal due to the net effect I am doing the same with many of my variables. the only variables I'm going to be concerned with are change in avalible O2, Delta T & Delta...

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