I haven't even put mine in yet? Any of you know if piston to valve clearance is an issue with a wiseco high comp & hot cams combination?

Does anyone know what the options are for exhaust? Companies?

 

Hotcams might have a misprint in their specs (either that or the stage 1 cam has way more duration than a stage 3 webcam!!!), so who knows what to believe. Somebody will have to call hotcams and 13itch enough to get to the bottom of it.

 

Definitely a misprint. (If definitely is spelled right.. lol) i think its more like .288 and not 388

 

<div class="FTQUOTE"><begin quote>Originally posted by: mjlar94

Definitely a misprint. (If definitely is spelled right.. lol) i think its more like .288 and not 388</end quote></div>

Well, if thats the case then its not too much different than stock anyway.

Ok, first off, there are 3 different ways we get specs from these guys.... .050, .040, .006

.040 = 1mm and .006 is commonly called seat-to-seat.

Stock is (intake open/intake close, exhaust open/exhaust close) 12/43, 45/12 at .040. That works out to be 235/237. Those numbers are duration (the degrees the valve stays open from the specified lift of .040).

Hotcams told me 14/41, 89.5/68 at .040 and that works out to be 235/337.5. Now, either the 89.5 or 68 is a misprint or the stage 1 hotcam is really like a stage 15 or something. If you suspect the 337.5 to really be a 237.5, then the hotcam stage 1 is really just a stock replacement cam and not even a stage 1 (the only difference is the hotcam has a wee bit more lift).

Here is a table at .040
stock 235/237
hotcam stage 1 235/337.5 or 235/237.5 or who knows???
webcam stage 1 is between 251 and 256 on both intake and exhaust (square cam)
webcam stage 2 is between 257 and 262 on both intake and exhaust (square cam)
megacycle stage 1 236/240
megacycle stage 2 282/284

Note: I had to guess at the .040 specs of the webcams using the profile of the stock cam. It should be close, although the stock cam is not square. I have the .050 specs for webcams that are exact from the owner of the company, but that doesn't help in comparing cams from other companies that list specs in .040.

Its always my opinion to pick a cam with more exhaust duration than intake duration if the exhaust valve is smaller than the intake valve. I know for a FACT that on a ford 460 v8 you want a cam that has a longer exhaust duration because of its small exhaust valve and very restrictive exhaust port.

Vince's cycle told me any lift over .280 is a waste and will only eat up your valve train faster and not add any noticable performance. He has bench flow numbers on hand to back his point up.

Refences: Stock .050 cam info from Lori at webcams. Stock .040 cam info from magacycle catalog. All webcam info from Lori at webcams. All megacycle info from their catalog. Hotcam info from James Schuster, Product Manager, C&L Companies, Hot Rods, Hot Cams, Pivot Works, 2751 Parkside Circle, Urbandale, IA 50322, 515-727-2321, jschuster@pivotworks.com

All this info and I didn't even charge $10, lol. I'm a dumbazz.

 

The lifts go like this:
Stock .324/.290
hotcam stage 1 .352/.298
webcam stage 1 .340/.340
webcam stage 2 .360/.360
megacycle stage 1 .400/.400
megacycle stage 2 .430/.430

 

alright im in 2 dilemmas, now i had to do a wiseco piston and get the jug bored, so what determines top dead center if there are 2 tdc's? (2 rotations?) does the plug fire every rotation or do i have to match it to the compression stroke?

Any tips for the LT230S kick-start model? the book isn't much help.

Plus valve guide clearance. (if I had a good caliper i'd measure it, it basically has the same lobes with a higher lift (about ~1mm clearance from the cam guide area.)

 

The plug fires on the compression and exhaust stroke.

Tips??? Gotta be more specific. I think a good tip would be to go a head and get the big bore kit now. You will want one once you start riding it. That's what happened to me. I'm only .080 over and wish I would have spent the extra $200 to get the big bore. Now, I'm just trying to beat the **** out of it so I can rebuild it again, lol.

Valve giudes are very hard steel pressed in the head to guide the valves and keep them straight. Not sure what you mean?

 

<div class="FTQUOTE"><begin quote>Originally posted by: mjlar94
(if I had a good caliper i'd measure it, it basically has the same lobes with a higher lift (about ~1mm clearance from the cam guide area.)</end quote></div>

That pretty much backs up my assumption that hotcams is basically a stock cam with a wee bit more lift. Otherwise, a 337.5 exhaust duration should be a pretty obvious difference by comparing the 2 cams.

 

sorry i still am very fond of my two stroke dt and this stuff is all new.

piston-to-valve clearance (the wiseco high comp & hot cams combination)
How do I know its safe to put back together?

how do i set the cam timing properly?

 

337.5 is only 22.5 degrees away from being a whole circle, LOL. So, the exhaust valve would be open for almost an entire rotation of the crank,,,, that's funny. I doubt you'd even be able to start the quad under 2 or 3000rpms!!! If at all!