Originally Posted by hammertime
Originally Posted by kod99
Originally Posted by hammertime
Originally Posted by kod99
Originally Posted by hammertime
Originally Posted by kod99
Originally Posted by hammertime
Look into rings from Wiseco or JE, low tension, there is hp in that area.
Did they say what the ring gap was ?
The end gap was 28 top ring and 26 second ring.
I'm gonna go to gapless top rings. Changing to a Sniper manifold at the same time. It will be a couple of weeks yet.
with injection the intake is a waste but if you every do a carb again there is a gain there.
David,
Which intake manifold are you running with your injection system?
I have the Sniper on it for carb purposes and a 454R sitting here for it also.
I saw some impressive claims of HP gains with the Sniper and assumed they were using a carb for the testing. I wondered if it did the same with injection. Now I know. Thanks, David.
They are a great intake with a carb and a good choice for anything but with injection there isnt any gains over any other decent brand intake.
Let us know how everything turns out when they redyno it.
Ok. The engine is done and I put the Sniper manifold on it. I took it to the dyno (Super-flo 902) on Friday and made 23 pulls on it. Made 3 pulls with a 1150 Holley Dominator carb on C16 first to seat the rings. Then I installed the Ron's terminator and switched to alcohol.
On alcohol, the engine would nose over on the horsepower curve at about 6000 to 6300 RPM.
The final configurations that worked, and didn't nose, although the horsepower curves did flatten out, over were:
39 nozzles - 82 pill - 31 degrees advanced timing
922 HP at 6400 RPM
829 ft# torque at 5200 RPM
41 nozzles - 88 pill - 33 degrees advanced timing
925 HP at 6400 RPM
833 ft# torque at 5200 RPM
Fuel pressure was 68 - 70 psi. I was using a 1/2 Enderle belt drive pump. I had it tested and it fowed at 5.5 GPM.
I did try one hit with the high speed bypass installed and set to 63 psi, but it didn't seem to help stop the nosing over.
The maximum RPM the engine would reach was 6500. I can't figure out why. Dirty air in the dyno room? The exhaust evac system was not sealed that well. The headers were dumping into 6" flex hoses which were exhausted, by a fan, to the outside of the building.
The vacuum pump could not keep up with the crankcase pressure. As the RPM came up, the crankcase would go from 12" of vacuum to 22 psi of pressure. I blew a hole in both the intake and pan gaskets (The Right Stuff). The richer the engine was, the higher the crankcase pressure. I am going to change the drive pump pulley to spin the vacuum pump at 75% instead of 50% of the crank. I hope this helps the crankcase pressure problem.
Another oddity is that with the 1150 carb on race gas, the air flow was 1148 cfm at 6500 RPM. With the 2100 cfm Terminator on alcohol, the airflow was only 1074 cfm at 6500 RPM.
I drained the oil after the dyno run and it wasn't very milky at all.
An input would be appreciated.