installing extra head gaskets on apex

[golfaddicted]

Are there some instructions posted online for this. I understand there are some cam timing changes that need to be made and maybe some torque changes from the manual. Thanks

 

[TurboJamie]

How thick are you going with the head gaksets, if you go 3 you are good for about 12 psi on pump fuel. I would NOT touch the cam timing at all.

 

[Jonny Rocket]

The MCX instructions have you change the intake timing with the head shim or head gasket. It suppose to help a lot. I am sure there are others on the forum that can explain way better than I. All I know is if you are going with a shim or thicker head gaskets you want to change the intake timing.

Greg, I also have the MCX instructions that you can borrow if you want. Only problem is I don't have them in electronic form. Maybe someone on the forum has them they can shoot your way.

J.

 

[rxrider]

When installing thicker head gaskets/shims the exhaust cam is moving in the right direction while the intake cam is moving in the less favorable direction. Slotting the intake cam sprocet will move the cam back to its original position. The movement of the exhaust cam and slotting the intake cam back to its original position moves the lobe centers apart, which is an advantage on a turboed sled reducing overlap. Overlap is when both exhaust and intake ports are open simultanously, beneficial on a NA engine, but not on a charged engine. Moving the lobe centers apart will reduce overlap and make more power in a charged application.

 

[TurboJamie]

If some more prone guys who have played with this stuff alot chime in you will find that slotting the cam hinders they at sea level.

 

[KnappAttack]

Installing 3 headgaskets in an EFI engine is fine for 12 lbs in the CPR front mount setup. I would not slot the intake cam for lower altitude. EVERYTIME I have done it, I have ended up going back to the stock cam alignment. Less overlap sure has not helped the machines I have tried it on, and I have tried it on everything from trail sleds to open-mod 30+ pounds of boost drag sleds, and they have slowed down everytime @ about 1000 feet of altitude. They just don't run nice and happy and you have to listen to what the engine is trying to tell you.

 

[powderlites]

Cam timming

One thing about these forms is everyone has different idea's
Cam timming if done right!! is very important on torque and HP.
Learned how to do over 20 years ago and using stock cams on apex i would go to minimun of 110 LOBE Centers.
Ask Hurricane how his motor's make power with proper cam timming.
I would set up for 112 - 114 degree and get a motorcycle mechanic that has done this before.
In Canada Motorcycle new mechanics now have to do it to past part of there ticket.
The guy that can make more power with less boost is the winner in my books.
http://www.powderlites.com

 

[Blue shadow]

When I had mine done two years ago 112 on both intake and exhause my comp drop down alot for snow racing ,and I was told to put it back to the stock position.With the stock timing I did get off the line much faster. Powderlites can you give us more info ? Is this how it works ,you may loose it on the start but gain more on its way.thanks

 

[golfaddicted]

THanks for the replys

A lot of opinions. I'm more confused than ever now...
Anybody else want to chime in. I appreciate any input.
Thanks

 

[Need for Speed 2]

I think cam timing is like Clutching some guys can run it succesfully others can not. I myself prefer moving the cam for higher boost #s @ valves open at the same time under boost is not a good thing Simons shoul chime in Im sure making 500h.p. sleds he has it figured out.

 

[Ted Jannetty]

How thick are you going with the head gaksets, if you go 3 you are good for about 12 psi on pump fuel. I would NOT touch the cam timing at all.

Ditto

 

[lakercr]

There are gains to be had with with cam timing if you are comfortable with a degree wheel and understand what you are doing. If that doesn't sound like you, stack the 3 gaskets, torque properly and go have fun. It will be a long time before you think you need any more power

 

[kinger]

^^^^^ LOL well said lakercr!!

 

[mbarryracing]

What is the purpose if shimming, or running multiple or thicker head gaskets?
I understand it is to reduce CR, but is it done when using stock pistons? What is the advantage? Don't have to yank the engine?

Don't take this the wrong way but sounds like just a band-aid for incorrect pistons / rods, headwork, charge cooling, etc
So help me out...
Thanks.

 

[Ted Jannetty]

What is the purpose if shimming, or running multiple or thicker head gaskets?
I understand it is to reduce CR, but is it done when using stock pistons? What is the advantage? Don't have to yank the engine?

Don't take this the wrong way but sounds like just a band-aid for incorrect pistons / rods, headwork, charge cooling, etc
So help me out...
Thanks.

Running Thicker or multipul head gaskets is a very effective way to reduce compression, Yamaha Pistons and rods are very Durable with Proper care and feeding.

Apex generally use 3 stock 0.017 gaskets for 11-12 psi boost on pump fuel
RX1 uses 2 Stock 0.027 head gaskets for same.

Ted.