FE Power Forums

FE Power Forums => FE Technical Forum => Topic started by: 66FAIRLANE on October 24, 2019, 09:34:04 PM

Title: Spring Pressure for SFT Break In
Post by: 66FAIRLANE on October 24, 2019, 09:34:04 PM

I will be using an old Crane Fireball 294 I used to run 20 years ago in a new build. I do not have matched lifters so will use new & follow normal cam break in procedures.

Is it worth swapping on some old worn out 80lb on the seat valve springs I have for this process or will 120 on the seat be fine?

Title: Re: Spring Pressure for SFT Break In
Post by: cjshaker on October 25, 2019, 12:48:06 AM

I'll let the smarter guys chime in on answers, but I love that cam! I used one for almost 25 years in my Highboy. Very torquey and has a solid midrange. If I could find an NOS one, I'd grab it up in a second!

Title: Re: Spring Pressure for SFT Break In
Post by: blykins on October 25, 2019, 04:35:25 AM

I aim for 100 lbs or less seat and under 300 lbs open.

Title: Re: Spring Pressure for SFT Break In
Post by: plovett on October 25, 2019, 07:44:30 AM

I think the open pressure is what matters.  I don't think the seat pressure matters. I do agree that under 300 lbs is a good number for open pressure for flat tappet break in. 

JMO,

paulie

Title: Re: Spring Pressure for SFT Break In
Post by: 66FAIRLANE on October 26, 2019, 12:06:58 AM

Thanks guys. Will check open & if over 300lb I will swap in the softies.

Title: Re: Spring Pressure for SFT Break In
Post by: 66FAIRLANE on October 26, 2019, 12:09:22 AM

Quote from: cjshaker on October 25, 2019, 12:48:06 AM

I'll let the smarter guys chime in on answers, but I love that cam! I used one for almost 25 years in my Highboy. Very torquey and has a solid midrange. If I could find an NOS one, I'd grab it up in a second!

I remember it ran pretty well all those years ago with a worn out engine, horrific exhaust manifolds & single pipe. Really interested to see how it goes with a fresh build & better bits & pieces.