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Tractor Pulling Discussion Forum

Cam grinding

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Casepuller

03-18-2004 20:28:12




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What do I need to know to tell the cam guy so he can get me a good grind. Who should I use out there. I don't have any flow bench figures on my heads or carb, where can I get this info?




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TimC

03-19-2004 09:42:06




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 Re: Cam grinding in reply to Casepuller, 03-18-2004 20:28:12  
Since you don't have flow data you can measure your ports. Length of intake and exhaust. You need to find the minimal port cross sectional area. You need valve size. Once a valve is lifted past .250 (i think) of it diameter it is pretty much finished flowing any usuable flow. I.E. a 2 inch valve won't flow a lot more past .500 inch lift "in most cases" without some fancy port work which in my opinion cant be done on a tractor without welding and epoxy."IN MOST CASES". Plus you just add to the strain on the valve train with to much lift and unnecessary harmonics are induced into the motor especially with a gear drive cam. Peak lift needs to be at max piston speed plus signal lag from top of piston to port entry. Usually occurs between 70 and 80 degrees ATDC. So you need to tell him the bore and stroke and rpm at which you want max hp or max torque. Carb cfm is vital info. He will for sure have to know the rockerarm ratio. All major cam grinders should know how to figure the grind you need. Comp cams, elgin cams, bullet cams. They understand the black art of cams.

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Earl S.

03-19-2004 08:18:56




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 Re: Cam grinding in reply to Casepuller, 03-18-2004 20:28:12  
If you need to tell the cam grinder man what you want, you need to find a cam grinder that knows how to spec a cam for you,he doesn't have grinds that works on all cams. They have to copy or create a blank for their grinder to follow.Example high rpm,low rpm, torque curve, lobe center, overlap. He should be able to tell you what blank he has available. Just my opinion. Earl



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LRN

03-19-2004 06:52:19




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 Re: Cam grinding in reply to Casepuller, 03-18-2004 20:28:12  
I built a Case 400 with a 251 engine stroked to 366 last year. I sent that cam to Robert's and he had his contacts grind it. I told him what I had and they took it from there. It works great.

Thanks, LRN



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Lamont

03-19-2004 21:07:20




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 Re: Re: Cam grinding in reply to LRN, 03-19-2004 06:52:19  
Please tell me what you did to your Case 251. I am in process of boring a 251 to make a 336. I'm interested in costs of stroking and who did it for you. Would like to build another one. Please email me the info.

Lamont



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