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Discussion Forum
:

RPMs

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Ryan

04-10-2000 08:53:32




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How can I increase the rpms on a WC(1937)?




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Gordon

04-12-2000 18:17:29




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 Re: RPMs in reply to Ryan, 04-10-2000 08:53:32  
If you have cast iron pistons be careful; I would not recommend increasing the RPM of a WC with cast iron pistons. If you have aluminum pistons then you can probably increase RPM to WD specifications providing the engine is in good mechanical condition and has good oil pressure. If you want more power you might try a replacement type manafold (that is also suitable for the WD, WD45 and the earily D17 engines) and a larger carb. (from a WD, WD45 or D17). Adjust the carb to run a little rich to help keep everything cooler. Also do not "lug" the engine; keep the RPM up even if you have to use a lower gear. Remember that you may be trading more power for reduced engine life. Good luck, be careful, Gordon

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Mike

04-11-2000 19:57:24




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 Re: RPMs in reply to Ryan, 04-10-2000 08:53:32  
Ryan - Increased crank speed won't necessarily guarantee an increase in HP. In order to increase HP, the engine would have to still develope good torque at that speed. Horse power is actually a calculation from torque and speed. Torque and speed can both be measured, but HP is calculated. The formula is: HP=(Torque x RPM)/5252 A useful modification would be to increase the torque the engine could produce within the speed range that the tractor was designed for. More air/fuel in the cylinders per cycle by means of a higher lift cam is a reasonable modification. Another possible modification would be to increase the compression ratio from the 5.5:1 to around 8.5 to 9:1. A higher compression ratio would give you noticable results in this case, as it is so low now. Anyone out there running compression ratios in the 9:1 range? (without detonation!) My general point is this: IF the engine is running near it's peak effiency at max governed speed, an increase in speed COULD actually reduce HP, due to the torque curve falling off so fast. I am a dynomometer tech at Eaton Corp, and am used to dealing with engines that turn up to 8,000+ RPM. I have to admit, short of my own 39' WC, I've never run an engine that runs this slow on the dyno. I'm sure the guys that have been around these tractors since the were new have a few trick they used to use to get more torque out of them... Good luck, and that's my $0.05!

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CP's A/C's

04-10-2000 15:52:27




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 Re: RPMs in reply to Ryan, 04-10-2000 08:53:32  
Take governor apart, drill holes in flyweights to make them lighter, that ought to blow it up....oh yeah, unless you were worried about Rusty Wallace blowing you clean out of the field, don't mess with excessive rpm cuz it'll just cost tons of money. CP



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Phil Auten (TX)

04-10-2000 19:22:08




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 Re: Re: RPMs in reply to CP's A/C's, 04-10-2000 15:52:27  
Actually, Ryan, I think the governor would need heavier weights to increase the RPMs. At least, that's the way I understand the operation of the governor. Since one of the ways the manufacturers got more power out of these old beasts was to increase the RPMs, you might see if a WD governor would fit, or see if the weights from a WD would fit. I wouldn't push these old engines too much over their original limits. Bumping the RPMs up by 200 would probably do what you need and still leave the engine reliable over the long term. Much more than that on a WC would'nt be too wise.

My 2,
Phil

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John C-IL

04-10-2000 19:45:12




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 Re: Re: Re: RPMs in reply to Phil Auten (TX), 04-10-2000 19:22:08  
Besides Rusty Wallace would put his mother in the fence. Heavier weights is the correct answer. Lighter flywheel for quicker Acceleration. NO2 if you really want more HP but it will probably only work once for about 10 seconds, then you can put an add in the classifieds for what you didn't break and submit an article about what went wrong.



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CP's A/C's

04-11-2000 18:14:52




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 Re: Re: Re: Re: RPMs in reply to John C-IL, 04-10-2000 19:45:12  
I have never had the opportunity or should i say the need to work on the governor of my WF, but John, yes, a lighter flywheel will promote quicker acceleration, as will nitros, but the question was higher max rpm, but my experience with a flyweight governor tells me that at a certain speed a weight will fly away from the restrictive force of a counter active spring, thereby permitting an acceptable max governed speed. A lighter weight with the same spring ,would require a higher speed to fly out, hence a higher governed speed. Just thought i'd warn you before the rest of the guys jumped on your case.(psst...Rusty's coming and he's really haulin')

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