Has any body tried this and had success? I was reading in the yammy forum and I guess it's a simple mod on the new 450 and I've wondered how far you could tweak the cams and still keep the valves and piston from contacting one another. I know how to experiment with them I just don't plan on pulling the head until this winter. If somebody is willing to share a success story either publicly or privetly I'll reciprocate with a power trick for them[img]i/expressions/face-icon-small-smile.gif[/img]

 

I've noticed a significant increase in topend by retarding the intake cam. (I run stock cams). The comparision was between 1/2 tooth advanced and 1/2 tooth retarded (one tooth change), which was accomplished using an 0.043" head gasket.

Valve clearance is an issue that would need to be looked at.

 

????? how can you retard the intake cam with an adjustable chain tensioner? I have played with the cam timing alot and the intake ALWAYS lines up.. No matter what gasket I used. Now the exhaust was that way and retarding the exhaust did increase top end for me. Advancing caused alot of poping and backfiring.

 

If my thinking is right you can advance the exhaust and retard the intake a good amount without valve issues but no power to gain there. I wish I had an adjustable cam sprocket cause I feel like advancing\retarding the intake would yield noticable results

 

I have no internal engine mods yet but is there a way to get more power by moving either cam clockwise or counterclockwise 1 tooth on the cam sprocket?

 

I was understanding Scooby's theory but got lost with Hurycne's reply.

Scooby:
Could you please share a few more details so the average guy can decide if this is an area, when using the stock cams, is worth trying on a stock machine. I run a few drags and in a stock class. You got my ear and curiosity. Thanks

 

I also want to know about using the stock setup as the "oldman" stated....... And me in my previous post.

 

I don't build motors. I took the easier route, just added some back pressure.

From what I've read, advancing the camshaft in relation to the crankshaft raises torque at middle range and lower rpm. Retarding lowers the middle range and lower rpm torque but raises the top output somewhat.

My head has been machined a few times and probably has 0.0085" removed. I run an 0.043" copper gasket which is thinner than stock. I run stock cams, valves. I have a low compression 8:1 forged piston with a dish in it, so valve clearance isn't as much of an issue for me.

The cam timing is retarded due to the extra slack in the timing chain resulting from the head machining and thinner gasket. In my case the retard was around a half tooth. This will add a little power on top but take away some lowend. When I moved the intake cam 1 tooth making it a half tooth advanced I lost topend.

For a stock piston, valves, cam, head gasket, I think you would gain HP by retarding the intake one tooth, assuming valve clearance is not an issue. But if you don't want to loose any bottom end then this is not the solution. I believe someone else in the forum has tried this.