Dracoro Posted April 14, 2005 Share Posted April 14, 2005 What are the torque figures for most commonly used engines in wesites? e.g. What is the likely torque figure in my VX 2.016V with twin 45 webers? and so on for the other injuns. Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 I *think* you can calculate it, but I'm not 100% sure... Try Horsepower x 5252 / max rpm So for a Vx 180bhp x 5252 / 7200rpm = 131.3ft/lb's But I'll stand to be corrected... Quote Link to comment Share on other sites More sharing options...
Matt Seabrook Posted April 14, 2005 Share Posted April 14, 2005 A Vx will make about 160ish lbft peak if the engine has been unmolseted. May engine makes 190lbft at 5500rpm but is running t/bodies cams etc. Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 Your Vx makes more than my Cossie? I doubt it Quote Link to comment Share on other sites More sharing options...
Matt Seabrook Posted April 14, 2005 Share Posted April 14, 2005 Oh well mate just the figure I got from the rolling road mate you know what they are like. Was this spec cam Quote Link to comment Share on other sites More sharing options...
Arm Posted April 14, 2005 Share Posted April 14, 2005 Nat asp 2L 16v motors struggle to break the 180 lb ft mark. Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 253bhp x 5252 / 8000rpm = 166ft/lbs. Yeah, I know *just* what rolling roads are like... Quote Link to comment Share on other sites More sharing options...
Bananaman Posted April 14, 2005 Share Posted April 14, 2005 I *think* you can calculate it, but I'm not 100% sure... Try Horsepower x 5252 / max rpm So for a Vx 180bhp x 5252 / 7200rpm = 131.3ft/lb's But I'll stand to be corrected... According to that calculation mines putting out 172lbs assuming max bhp@8000rpm Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 I'm still waiting to be corrected on the calc though... Quote Link to comment Share on other sites More sharing options...
Gazza Posted April 14, 2005 Share Posted April 14, 2005 .... interesting to compare with the turbo 434inch V8 on American Hotrod that was being set up on the engine dyno: 690ftlb ... that was BEFORE the boost comes in What torque do people have from their Seight V8's, ot of interest? Quote Link to comment Share on other sites More sharing options...
geelhoed Posted April 14, 2005 Share Posted April 14, 2005 I *think* you can calculate it, but I'm not 100% sure... Try Horsepower x 5252 / max rpm So for a Vx 180bhp x 5252 / 7200rpm = 131.3ft/lb's But I'll stand to be corrected... g gravitational acceleration T torque P power w angular velocity bhp = 550 lb * ft /s * g rpm = pi/30 rad/s the product of the angular velocity and the torque is the power so P=16500 / pi T*w = 5252 * T* w So the value is correct, but to take the maximum rpm is strange you have to take the power value at the specific rpm to get the torque at that rpm So from the graph: 6500 rpm - > 220 bhp would give 177 torques. Quote Link to comment Share on other sites More sharing options...
Matt Seabrook Posted April 14, 2005 Share Posted April 14, 2005 Nat asp 2L 16v motors struggle to break the 180 lb ft mark Yep agreed Ash just the only thing I have to go on is what I got from the rolling road and SBD's quoted figure for the cam spec. Heres one to make you smile then Could only come from SBD Quote Link to comment Share on other sites More sharing options...
ChrisG Posted April 14, 2005 Share Posted April 14, 2005 Yep, Blatman's calc is only calculating the torque at peak power, not necessarily the maximum torque of the engine. Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 Yep, Blatman's calc is only calculating the torque at peak power, not necessarily the maximum torque of the engine. Quote Link to comment Share on other sites More sharing options...
Blatman Posted April 14, 2005 Share Posted April 14, 2005 Lets try a backwards calc. (Torque x Engine speed) / 5,252 = Horsepower (190 x 5500) / 5252 = 198bhp. Either Matts/SBD's torque figure is wrong, or you need to calculate it at max rpm (8000rpm in Matts case according to the graph), which gives 289bhp. I don't think so... So, somethings wrong somewhere with Matts/SBD's quoted figures... Have a look here. Quote Link to comment Share on other sites More sharing options...
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