Downey-offroad torque cam

[ClemsonCruiser]

Anyone have experience with downey-offroad and more specifically with this torque cam for the 2f. Also in general what is the feelin about using a performance cam?

here is a link to the cam:http://www.downeyoff-road.com/EngineComponents/

thanks guys
JP

 

[offcamber40]

I read somewhere that the lift on those is fairly extreme and requires beefier valve springs to keep from causing damage.. Downey's cam is a re-grind of a factory cam if I remember correctly. You may want to look at RV grind cams that use a factory billet.. these put less strain on the valvetrain.

 

[ClemsonCruiser]

yeah downey's site mentions the need for strong vavle springs which I would have gotten also, but I will def. check out the RV grind cams, any idea who has the best deals on them. Thanks

 

[labartonmd]

more lift equals heavier springs equals more frictional/ rotational energy lost. The problem with the F/ 2F is exhaust limited more than intake limited. Some advocate a split duration cam grind with stock lift. This is usually 204 degree intake and 214 degree exhaust with longer overlap to improve scavenging of the combustion chamber. Emissions go up, mileage goes down but not much, and power goes up via increased volumetric efficiency. That cam would be wasted unless you also ran dual 3 into 1 headers and acustom exhaust. If you want to keep the torque and mileage, go with stock 204 cam and dual 3 into 1 headers.

 

[ClemsonCruiser]

I appreciate the info guys, sounds like I will just save the money and stick with the stock cam.

Thanks
JP

 

[Chef]

While a lot of the tehchnical info about stiffer valve springs etc is generally true, you're talking about a 4000 rpm tractor motor here. I've used a custom ground knockoff of cliffords torque cam and really like it. I got the specs from Mark Whatley, I've got them at the shop somewhere. Not much more lift that stock, but duration and overlaps increased and moved a little to promote better fcylinder fill. I've never upgraded or even replaced the tired old 2F valve springs. But, I don't over-rev the motor either. You cannot think aof a cam as a by itself solution, especially in a low tech tractor motor like a f/2f. You must think in terms of adding compression, carb work, lightening and balancing rotating masses, header and exhaust in a systemic fashion. The idea is to maximze intake flow, cylinder fill, exhasut flow efficiency, cylinder scavenging, etc all at once with all the variables working together as much as possible...