Interesting read on m62 / m90 rotors

[robaru]

Hi all , I don't post much , more of a listener than a talker and don't get on the computer very often but there is an interesting concept for rotors being passed around on red line forums that may interest the m90 users here if it pans out . There is a guy over there attempting to make new rotors with an increased twist in them if I can figure how to post a link I will , theres a lot of off topic conversation in the thread but some interesting ideas . I believe the thread title is h62 rotors apparantly there were some special rotors released for the m62 that had the increased twist and he will attempting to cnc some for m62 and m90 users .http://www.redlineforums.com/forums/...62-rotors.html

[redfire427]

Interesting read, but the OP has zero chance of pulling it off. As a 25 year CNC machinist, I can tell you that the machining time and tolerances would be ridiculous, not to mention the material used is very specific and also needs to be balanced. Nice to see his ambition, but a reality check will be coming soon.

Carmen

[robaru]

The tolerances I think are doable , the balance will undoubtedly be a major problem , along with sourcing the proper rotor and coating materials it may end up being cost prohibitive once he does , if he does actually make it work , I'm not sure if increasing the twist will give him the results he's looking for but I do hope it works out for him , then again I never thought those guys who did the 4.6 lower intake manifold for the gt500 blower would ever get it off the ground but they are doing quite well now . This if it can yield results in cost effective manner will unduobtedly be a small gold mine with all the different vehicles using m90's , assuming the basic casing is the same for the different generations of m90 .

[Pentalab]

The tolerances I think are doable , the balance will undoubtedly be a major problem , along with sourcing the proper rotor and coating materials it may end up being cost prohibitive once he does , if he does actually make it work , I'm not sure if increasing the twist will give him the results he's looking for but I do hope it works out for him , then again I never thought those guys who did the 4.6 lower intake manifold for the gt500 blower would ever get it off the ground but they are doing quite well now . This if it can yield results in cost effective manner will unduobtedly be a small gold mine with all the different vehicles using m90's , assuming the basic casing is the same for the different generations of m90 .

I read it too. He was talking about making a triple lobe rotor.... but with a 120 deg twist, instead of a 60 deg twist. Then he was onto plan B..with a 4 lobe-160 deg twist, like a TVS. Ok, with either of his designs, will the displacement remain the same. The M90 as is..... is 1.475L If his new rotor pack designs end up being the same 90 ci displacement, the only advantage to em would be greater eff, and less heat, that's it. If the displacement ends up slightly more, with the 4 lobe-160deg twist rotors, retrofitted and stuffed into old M90 casing, they might have a winner.

I'm surprised that Eaton doesn't offer a TVS rotor style upgrade for the older technology M series rotor's. However, it's probably not cost effective.

OK, what's the deal on using the GT-500 M-122 blower with a 4.6L motor. That would require a newly designed intake manifold. I think Roush actually has them, but wants something like $2700.00 for the manifold alone. Considering all the TVS and whipple and K bell conversions done on GT-500's, there must be loads of used M-122 blowers laying about. The 2013 GT-500 uses a TVS-2300. Was the M-122 used on 2007-2012 GT-500's. If that's the case, why would Ford use an obsolete M-122 blower on a 2010-2011-2012 GT-500. That makes no sense at all. M-122 = 2L displacement. You may as well replace the M90 with the newer TVS-2300 if any upgrade at all is considered. A TVS-2300 upgrade is not cheap for these 4.6L motors. To do it right, you need dual fead setup and also dual GT-500 pumps (or a bap). The TVS-2300 for the 5.0L motor is more cost effective, no dual fead required, nor any requirement for dual GT-500 pumps, or bap.

Hat's off to the fellow, if he can pull it off though. CNC machining to close tolerances, then coating the rotor's is one thing, balancing it to 18 krpm is another story. The M-122 swap with a new manifold would work for sure.

Jimbo