Engine Building-What Products?

[1ViciousGSX]

Originally Posted by TalonFiero

Mike what are you saying? Shane, Cher, Mo, and myself all overlaid a stock 2.4 cam gear on top of a stock 2.0 cam gear and remarked the timing marks. Pretty simple and widely done, back when I did the 2.4 swap I don't think there were 2.4 cam gears available other than stock.

Jim

The point you are missing is "Why are they different?"

They are different because the 2.4L belt is longer by one (1) more tooth to compensate for the taller (6mm) deck height of the 2.4L block. Not an even number such as 2 (two) teeth. All remarking the gear does is get you close, but the cams are still off by 1/2 tooth which equals 3-4 deg of timing. If the gears were stamped the same and marked the same they would line up the same, but they don't. That's why Mitsu makes a different gear for the 2.4L. Lining up the marks as close as possible still has the cam dowl pin out of position which is what times the cams.

I has to use Fidanza gears to get the adjustablility to correct the timing. When I degreed my cams (HKS 272's) in both were off by 3-4 deg because of the longer belt. I just remarked the cam gears..

[Super Bleeder!!]

Good explanation. But the fact remains that they made power with remarked stockers, and more importantly i'm out of money!

[TalonFiero]

I wonder how off mine are then if the exhaust is an actual 2.4 gear and the intake is a remarked 2.0 gear?

[blageo23]

I am getting aftermarket adjustable cams(I dont care what the cost diffference is!). Do I need to remark them and then add 3-4 degrees?

[tim]

Originally Posted by blageo23

I am getting aftermarket adjustable cams(I dont care what the cost diffference is!). Do I need to remark them and then add 3-4 degrees?

Just degree your cams so you are safe. Dont just make an adjustment based off the one tooth difference.

[Super Bleeder!!]

Degreeing is too much work. How about when you dyno you play around with them and get some hard numbers. Less work and instant results.

[niterydr]

Originally Posted by Super Bleeder!!

Degreeing is too much work. How about when you dyno you play around with them and get some hard numbers. Less work and instant results.

That is a great idea until your pistons and valves do a slow dance.
Dyno time isn't cheap, I"d degree the cams.
Floppy, is someone posting on your computer?

Most off the shelf grinds are just fine and close to perfect at 0,0 for a dsm.

[Goat Blower]

Originally Posted by niterydr

Most off the shelf grinds are just fine and close to perfect at 0,0 for a dsm.

That's the case now, but if someone's buying used cams from a few years back, the Crowers and some others were way off from the card. And that goes out the window for the 2.4's, or any motor that's been decked.

[niterydr]

Originally Posted by Goat Blower

That's the case now, but if someone's buying used cams from a few years back, the Crowers and some others were way off from the card. And that goes out the window for the 2.4's, or any motor that's been decked.

Well of course. That is why we degree cams on all the longblocks we put together, and tune all of our personal cars on the rollers with cam gears.
(yes my cam gears are adjusted, they aren't there for looks).

[Goat Blower]

I was too lazy to degree my cams and just picked up some stocker 2.4 gears for the meantime. $50 in cam gears is just one less night out on the town, which ain't a bad thing anymore.

[niterydr]

Originally Posted by Goat Blower

I was too lazy to degree my cams and just picked up some stocker 2.4 gears for the meantime. $50 in cam gears is just one less night out on the town, which ain't a bad thing anymore.

Heck yeah. It was a cheap solution and your car does make power. Now you know when you want to, you can go back to that aspect of your build and pick up the power that was potential left on the table.

[Super Bleeder!!]

Hey on the subject of engine building, what kind of piston to wall clearances do you guys run?

I talked to a lot of people and was told a range of things, so i pretty much averaged them and went with .004"

[1ViciousGSX]

Originally Posted by Super Bleeder!!

Hey on the subject of engine building, what kind of piston to wall clearances do you guys run?

I talked to a lot of people and was told a range of things, so i pretty much averaged them and went with .004"

Run the loose side of what the piston manufacturer says.

[JET]

I went .0035" on Wiseco's. They don't expand as much as most do.

[Super Bleeder!!]

I should have said what pistons i have; and those would be Wisecos as well.

[Pushit2.0]

.004 will be fine for a wiseco, this depends on piston type and what is planned for the motor.

~John