Turbo cam timing question

[slymax]

My MCX kit recommends adjusting the cam sprockets after installing the headshim to put the valve timing back to where it was, which is what I have done many times. I notice one kit, think it was Powderlite, using a jig that did the same thing with the exhaust cam but retarding the intake cam a full tooth. Can any performance engine builders recommend if it would it be advantageous to run the intake cam a full tooth retarded on the MCX, or just a slight adjustment to put back to stock. Seems retarding the intake would leave the valves open later, possibly lowering comp ratio more? I plan on running about 17lbs with a headshim, on 100LL as I have done in the past. All internals will be stock.

 

[TBird]

I read many posts about adjusting the cams diffrent from MCX recommendations so i had to ask Erik about that, long story short, i still have the cam adjustment exactly as MCX recommends .
If you want detailed information call or mail Erik @ MCX.

 

[slymax]

Thanks, you know how it is, always trying to improve my installs. I did a little looking around and it is a Powderlites jig I had seen showing the cam retarded more. I saw photos from the Hurricane build and those cams look close to MCX. I don't have a degree wheel to measure the lobe centres. I could rig one up but I don't know how many degrees I should be at anyway

 

[TBird]

I know exactly how it is .
Thats why i run with an RB3, in parallell with MCX display!
And thats why i'm looking forward to MCX soon to come stuff!

 

[Blue shadow]

It should be 114 degree on both intake and exhaust to have full power on low and high boost.

 

[TBird]

It should be 114 degree on both intake and exhaust to have full power on low and high boost.

And you know that HOW?
And you know thats the case with all type of chargers, even MCX kits, and have nothing to do with systems back pressure?
I know for a fact that MCX recommendations works best with their kit, they got a lot of experience thru all the years, with countless of hours on their Superflow SF901 dyno to find out the setup for highest HP and thru field testing for the best setup!
I hope you understand that i can't just take your word on that 114° works the best, and say to Erik @ MCX that he can throw his dyno and his testing on the garbage!

 

[rxrider]

Guys it's all in the package MCX sells, reliable HP on pumpgas, set up the way they have found works the best in their application.

With different turbo, header pipe length with and design, downpipe desigh and restriction, air filter restriction, ignition timing and so on, 114 lobe centers intake and exhaust would work wonders.

I'm running kinda semi MCX cam timing as I'm running their setup for 3 gaskets while running only 2 gaskets thus having more intake retard and less exhaust advance as the original setup. Now when going front mount I want to spread the lobe centers more when I can find the time.

Off topic but, haven't heard anyone running 114 naturally aspirated

 

[TBird]

Hope no one got offended of what i wrote earlier, i can sometimes get a bit "to serious" (lack of better word in english) when i read about someone who read something about how someone else found out that there is "free horsepower" that is left on the table if you only ......

 

[rxrider]

no problem on my part TBird

The Apex exhaust cam are already advanced a lot more than on the RX-1 so degreeing the cams MCX way gives a lot more power than the RX-1 at the same boost level On the RX-1 there's a gain advancing the exhaust and retarding the intake, on the MTX I really don't know.

 

[Blue shadow]

Will I got my 114 degrees from Dave (Hurricane ) and Dave from powderlites .If it did not work they would not be using this .They have tried it on the dyno and It works,Dave can you give more detail on this subject,thanks

 

[TBird]

There you go, completely diffrent systems, with completely diffrent supposition, you can't duplicate their setup and transfer them to MCX setup!
The setup MCX recommends for their kit works on their kit, i'm not saying it works with other kits such as PL because it doesent, exactly as PL recommends another setup for their kit.
When someone write "It should be 114 degree on both intake and exhaust to have full power on low and high boost" i get interested to hear how that person know that!
Hope you understand why one setting work with one setup and doesen't on others.
And if you don't you maybe doesen't know how much of a difference their is between an MCX and an PL kit.