LS2 heads 3 valves and current bad boy cams?
#1
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LS2 heads 3 valves and current bad boy cams?
Ok IF the rumors are true i.e. LS2 heads will have 3 valves/cylinder and be fully reverse compatable with the LS1 engine, how do you think they would work with the current high HP cams out there like the LGM G5X-x series?
So far these cams will pull hard to current redlines. Rumors are also that these heads have been tested to 8K rpms. Would these heads give more low end hp/tq and pull higher at the top as well?
Interested in opinions.
So far these cams will pull hard to current redlines. Rumors are also that these heads have been tested to 8K rpms. Would these heads give more low end hp/tq and pull higher at the top as well?
Interested in opinions.
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This may be a dumb question; well maybe an unimformed question. Frankly, if one means by 'reverse compatible' with the LS1, I'd like to see how they are going to make the rocker set up work. Either they are running one big intake and two small (or visa versa). How are they going to accomplish that with a cam-in-block setup? I thought most motors with greater than 2 valves per cylinder are OHC units?
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Originally Posted by Proud2bSS
I thought most motors with greater than 2 valves per cylinder are OHC units?
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I have a feeling the intake valves are going to be lower lift since there's 2 of them and because of their position. If that's the case, i think the lift on current high lift cams is gonna be too much. On the other hand, the rocker arms might be a lower ratio than the current 1.7:1 because the valves are closer to the pushrods and the rocker arms must be smaller. Hard to tell from looking at the picture.
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I dont think the big cams will work well at all. It would let to much air in and not enough out (2 int & 1 ex. valve). The lift on the intake side will have to be decreased.
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Originally Posted by flynbludream
Ok IF the rumors are true i.e. LS2 heads will have 3 valves/cylinder and be fully reverse compatable with the LS1 engine, how do you think they would work with the current high HP cams out there like the LGM G5X-x series?
So far these cams will pull hard to current redlines. Rumors are also that these heads have been tested to 8K rpms. Would these heads give more low end hp/tq and pull higher at the top as well?
Interested in opinions.
So far these cams will pull hard to current redlines. Rumors are also that these heads have been tested to 8K rpms. Would these heads give more low end hp/tq and pull higher at the top as well?
Interested in opinions.
#10
Originally Posted by sr71bb
Initially, my understanding is the ls2 heads will still have just the two valves. I thought whenever "new" LS6 comes out that THEN the vavle arrangement would be 3 valves per cyinder,
Todd
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Thanx for education! My only comment about the multi valve, single pushrod setup would be the huge potential wear factor on the cam/lifter/pushrod/rocker system. Twice the spring pressure, twice the geometry and associated force. Would this not also lower the potential redline?
But heck, what do I know?! If they build it, drop it into a factory ride with a warranty, then it must work!
But heck, what do I know?! If they build it, drop it into a factory ride with a warranty, then it must work!
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Originally Posted by Proud2bSS
Thanx for education! My only comment about the multi valve, single pushrod setup would be the huge potential wear factor on the cam/lifter/pushrod/rocker system. Twice the spring pressure, twice the geometry and associated force. Would this not also lower the potential redline?
1. Each intake valve is significantly smaller, so they'll be able to use less spring pressure on each spring. The total mass of the valves won't be twice the mass of an ls1 valve, so the spring pressure won't need to be twice as much either.
2. With less intake valve lift, they can get away with even less spring pressure to control valve float.
So i'm guessing there'll be more wear than on the ls1, but not twice as much. Maybe they'll use roller cam bearings to reduce wear . They'll probably take care of the redline by using good valvesprings from the factory, as opposed to the weak ls1 springs. JMO.
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Originally Posted by Proud2bSS
Pardon my ignorance: will these heads be 'reverse compatible' as is 'bolt-ons' for our present LS1 blocks?
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The 3 valve/4 valve type head is good to a point.They rev to unreal rpms,but our lower end can't handle the high rpm as much.
When I changed valve springs on my 96 CBR 900(4 valve)I did it by hand without a compressor.Very light spring pressure ,but reved to 14,000 rpm.
When I changed valve springs on my 96 CBR 900(4 valve)I did it by hand without a compressor.Very light spring pressure ,but reved to 14,000 rpm.
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Originally Posted by XLR8NSS
There has been talk that they will be. They still only use two pushrods in the conventional spots so it's a possibility.
I reckon time will tell.....
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They'll probably fit in the next generation Fbody...whatever it might be.
BTW, the motor in those pics looks like a truck motor from the accessory layout and the threaded post on the water pump pulley for an engine driven fan. The fuel rail looks VERY similiar also.
BTW, the motor in those pics looks like a truck motor from the accessory layout and the threaded post on the water pump pulley for an engine driven fan. The fuel rail looks VERY similiar also.