I am unsure on which way to move the cams in order to decrease compression on a nytro? I know it may be hard to explain through message but any info may help.
How to drop nytro compression?
- Thread starter Archineddy
- Start date
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SPOOLED
Active member
you cant change the compression by moving the cams. compression is changed by compression volume. head shim or lower compression pistons. if you are talking about taking the over lap out of the cams you can do that by adjusting the cams. advancing the exhaust and retarding the intake.
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Yea i am talking about retarding the timing but the manual is unclear on which way is which when moving the cam off the stock timing marks...
No i have not. Im not sure what you mean by that, i just assumed i offset the cam gears one way or another from the stock markings...must be more to it?
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Turbo11T
Well-known member
Cams
You will have to slot the cam gears.
The proper way to do it is get a degree wheel, tdc gauge and dial travel indicator.
I just did this on my vector motor. You want to get the lobe centers to 112-114 on both the intake and exhaust. You can do some reading on ty4stroke.com and there is some good tuturials on doing it. It is pretty in depth though.
Once the cams are moved the dots will be towards the middle on both the exhaust and intake.
You will have to slot the cam gears.
The proper way to do it is get a degree wheel, tdc gauge and dial travel indicator.
I just did this on my vector motor. You want to get the lobe centers to 112-114 on both the intake and exhaust. You can do some reading on ty4stroke.com and there is some good tuturials on doing it. It is pretty in depth though.
Once the cams are moved the dots will be towards the middle on both the exhaust and intake.
Might be best to send them into somone? Right now i am just running two head gaskets. How much boost could i run with that setup without changing to overlap?...Or is it necessary to get maximum performance out of my turbo?
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Turbo11T
Well-known member
cam timing
it is best to do the cam timing to get everything out of the turbo. I didn't have it done last year and will this year we will see how big of a difference it is. I am guessing alot. I do not know if the nytro will be as much. But I would guess it is still a measureable difference.
it is best to do the cam timing to get everything out of the turbo. I didn't have it done last year and will this year we will see how big of a difference it is. I am guessing alot. I do not know if the nytro will be as much. But I would guess it is still a measureable difference.
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BLUE BLOOD
Member
CALL DAVE AT HURRICANE PERFORMANCE AND GET A CAM JIG.
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mastertech
Well-known member
Drop it like its hot..
Not sure what you mean by drop it like its hot...?? But anyway thanks for the help everyone and ill see what i can figure out from here.
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big_red1a
Well-known member
Sloting cam gears
1. Could you show pics of these tools?
2. Do all the turbos and engines reduce the overlap the same amount? i think impulse is 3.2mm
3. If so does anyone want to sell the used jig from hurricane?
1. Could you show pics of these tools?
2. Do all the turbos and engines reduce the overlap the same amount? i think impulse is 3.2mm
3. If so does anyone want to sell the used jig from hurricane?
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Turbo11T
Well-known member
1. I don't have any pictures of actually doing the timing with the tools on the motor. I do have a head on the bench I can take some pics of though. Really it is pretty straight forward and easy to do. A degree wheel just mounts to the clutch, I had to make a special bushing to have it centered. Then I just used a pc of steel and bolted it on top of the cam caps, the mag base them goes on that and a 1 inch dial travel indicator goes on that in a straight line with the valve. Just have to get it on the vavle bucket and have it not hit the cam lobe as it comes around so it doesn't move. I then used a piston stop, I bought a long metric bolt. I think it was like a m10 1.00 thread. Either way I just took my spark plug with me and compared it at the hardware store. Just screw that into the plug hole and then rotate the engine slowly until it hits the stop, note the degrees. Then rotate it the other way till it stops. For instance I got 16 degrees the one way and 20 the other. Then set the degree wheel at 18 degrees. Then remove the stop. This should get your degree wheel set at exact tdc.
Start on the intake side of the motor make sure that the dial indicator is set at 0 tdc and then turn the motor the correct direction until the indicator shows .040 of lift(travel). Note the degree on the wheel. Mine was 5 then rotate the engine till the dial reads the same on the closing.(.040 before the valve is closed). Stop and read the degree wheel. Mine read 46. Then take the two numbers.
open 5 degrees
close 46 degrees
=52
+180/2
- 5(smaller number from above)
= 110.5 lobe centers
now repeat this on the exhaust side. I ended up with 110.5 lobe center on the intake and 113 on the exhaust and I am happy with that. it is a huge change from 98 on both intake and exhaust on the vector.
2. Each engine builder may have a different amount that they want to change the lobe centers but the above way is still the best way to ensure proper cam timing. I am pretty sure it is safe to say that pl reccommends 114 on the nytro, vector and apex motors.
3. Caution, for anyone out there reading the NYTRO jig may NOT work with the vector. As the stock cam timing on the two engines are dramatically different.
I definately can write up a better tutorial on the caming timing then I did above if people would like. I was really worried about doing it but it went really well. It is good to know what I have and it felt good to learn somethign new.
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It is very easy just take out one of the spark plugs, it runs more effient, That is what i did on my supercharged Venture and it runs like a champ..Good LUck my friend..
Learn how an engine works before you humilliate yourself on this forum!!
Love Marv!!!!
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BLUE BLOOD
Member
It is very easy just take out one of the spark plugs, it runs more efficient, That is what i did on my supercharged Venture and it runs like a champ..Good LUck my friend..
Learn how an engine works before you humiliate yourself on this forum!!
Love Marv!!!!
SNOPRO PANTHER JR- SO YOU MUST BE ONE OF THOSE GUYS THAT KICK'S A CRUTCH OUT FROM UNDERNEATH SOMEONE.
LOVE!!! KEITH
BB, just ignore him he's a flamer. Everything he posts is nonsense anyway.
Lets see a pic or your sled snopro....who built it for you?
You should also try "spell check" so you don't humiliate* yourself online period...don't worry, it's free!!
You should also try "spell check" so you don't humiliate* yourself online period...don't worry, it's free!!
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Also snopro...what happens when the exhaust is advanced and the intake is retarded??? Just curious
