Cam choice

[Don W.]

This is mostly a curiosity question but...

I will be building my motor again for the umpteenth time (cracked cyl) and I was thinking of changing the cam. Current cam is a Comp 412. Don't know if this holds water or not but I was thinking a hotter cam would allow the motor to make the same HP on less boost. Either a Comp 422 or maybe even a custom.

Thoughts??

Thanks!

 

[sy#2716]

Re: Cam choice

I would go custom there are alot better cams out there and they are not that much more. I would get ahold of R-rue at turbotime or Nolan at campbell and they can spec you one out for the build that you are going to run.

 

[dgoodhue]

Re: Cam choice

I would do a custom cam as well, I have Turbo Time 214 (duration) Cam, you may want to look into the 218 TT Cam Tooky used.

 

[nallj92]

Re: Cam choice

i have the specs off my custom cam from campbell, you can call comp cams up and tell them what lobes style and duration lift etc. then they can make it for you also.

 

[dgoodhue]

Re: Cam choice

i have the specs off my custom cam from campbell, you can call comp cams up and tell them what lobes style and duration lift etc. then they can make it for you also.

I would just buy the Custom Cam from Campbell if that is what you want. (I know which lobes TurboTime is using from Comp Cams Catalog as well as one of Campbell custom cams). I know in E-Rue's case that he did a few cam swaps testing the lobes out, might as well give him a little bit return of for his R&D.

 

[dgoodhue]

Re: Cam choice

With all the available CNC, and other modern production techniques, can any profile now be drawn up, and the machine can produce it? If so, there are a myriad of design concerns in producing workable cam profiles. I wonder how much R&D goes into new profiles, or is the Development work left for the customer to try?

I'd look for a cam that is performing in a similar application for someone else. Rather than 'let someone draw one up for you'. If they even can. Based on some discussion regarding the closing of Crane, and the fact that many of the patterns were Crane-proprietary, some profiles were 'lost' to further production. I'm thinking that cams are still produced the "old way". From master profile patterns.

Most of Comp Cams custom grinds are from master lobe catalog, most are just picking lobes from that catalog. Their is more to cam lobe than just peak lift and duration. I imagine if you have $$$$ you can have them make a truly custom lobes for your cam.

 

[turbodig]

Re: Cam choice

Most of Comp Cams custom grinds are from master lobe catalog, most are just picking lobes from that catalog. Their is more to cam lobe than just peak lift and duration. I imagine if you have $$$$ you can have them make a truly custom lobes for your cam.

x2. Most "custom" cams are done as a cam blank, plus one of the catalog lobe profiles ground to specific centerlines. So, in essence you're selecting from one of their available profiles.

I have a custom cam from Dan Strezo @ DLSengines. He does a lot of turbo-spec cams in the GN world, and has done several heavy-hitter cams for Sys/Tys.

 

[Don W.]

Re: Cam choice

Good info guys. My machinist apparently has access to custom grinders so will check him as well.

BTW Stripped the new block today and it looks good. Standard bore, nothing obvious. Crank looks perfect. Normal bearing wear. It's already at the machine shop, prolly hear form them next week.

I'm in no rush so will fire off some PM's and emails next week.

Thanks much for the info.

 

[eviltwin]

Re: Cam choice

Good info guys. My machinist apparently has access to custom grinders so will check him as well.

BTW Stripped the new block today and it looks good. Standard bore, nothing obvious. Crank looks perfect. Normal bearing wear. It's already at the machine shop, prolly hear form them next week.

I'm in no rush so will fire off some PM's and emails next week.

Thanks much for the info.

glad the my engine looks good inside. hope everything goes well for you.

 

[Don W.]

Re: Cam choice

glad the my engine looks good inside. hope everything goes well for you.

Yup, thanks. This will be a fall/winter project so it will be awhile before it runs. Tip of the hat to Garrison for making his motor available to me.:tup:

 

[jklein68]

Re: Cam choice

Would you guys mind posting any of your CAM specs? I going to go with a custom grind but nothing is better than hearing from people that already have them installed. I usually have Lunati do the Cams for me. I have also worked with Bullet before.

Thanks!