excaliber

does anybody have any experience with these blowers?pros/cons.i dont know anybody who has used them.they all use littlefield or BDS blowers.i am asking because i may have found some pretty reasonable with carbs and intercoolers. thanks

puder

i they are 2 lobe like the 174 is, they aren't as efficient as the 3 lobe ones liek eth BDS or littlefield

Mbam

Puder, in theory yes but we made the same power with them as a 6-71 BDS in back to back testing (at the same boost). Also found the fuel distribution to be better.

bobby daniels

I AGREE PUDER THE TWO LOBE ROTOR IS EXCLENT IN A BOAT OR CAR AS IT DOES NOT TEND TO CHOP UP THE INTAKE CHARGE AS MUCH AN DOES SEEM TO MAKE ITS POWER AT A LOWER R P M ON THE DYNO WE FEEL LIKE ITS DUE TO MOVEING SO MUCH AIR AND FUEL IN TWO STROKES (ROUGH TERM) COMPARED TO THREE ALL IN ALL THERE GREAT

paradigm shift

What about a larger motor install. Say a 540 or 572 and compared to a 871 or 1071 as to a 420 mega blower? Low boost say 6 to 8 lbs.

Mbam

I pulled 1000 hp @ 6000 RPM out of my 557's, big roller cam, good heads, intercoooled, etc. I also built some 588's that made about 870 on 89 octane, hydrauilc flat tappet. No question that we were running out of blower on the 588's, but we reached the target HP. Used 1471's on some 653's. We did some back to back tests on them starting with 871's, but I cannot remember the numbers. It has been a number of years since I did any engines.

paradigm shift

[QUOTE]Originally posted by Mbam
[B]I pulled 1000 hp @ 6000 RPM out of my 557's, big roller cam, good heads, intercoooled, etc. I also built some 588's that made about 870 on 89 octane, hydrauilc flat tappet.

Marc with todays gas I have thought about how much HP reliably could be built with a 540 or 572 with 89 or 87 octane. I am sure there is more to it than just lower boost. Care to share any secrets?

Mbam

What do you consider a reasonable lifespan? The 557's would run on 89 octane, and were running fine at 40 hours when I pulled them apart - but I changed lifters every 50 hours and checked and set as needed the valve lash every 5 hours or so. The 653's made almost 1200HP on 89 octane, but broke a spring and dropped a valve at 50 hours. The one that would go the distance was the 588, that was a 0 maintainance package.

There is more to cooling than just dumping cold water in the front of the block, and more to the oil system than just a big pan. Once those are figured out the limitation is the valve train. I have not seen any magic bullets there yet. I still seem to be stuck at a 50 hour lifespan for the big HP (1000 +) roller tappet stuff. It might change as I have a few ideas kicking around, but it will be a while at the pace I am moving.

bobby daniels

I,VE USED THE 420 ON 540'S A TON WITH GREAT SUCESS AT 8LBS
THE 572 STARTED TO GET UNHAPPY AT 6 LBS DUE TO HEAT SO I LIKE 540'S AND 557'S WITH THE MEGA BLOWER

USE SOME GOOD ALUM.HEADS WITH MIDDLE OF THE ROAD COMPRESSION AND GOOD CAM 114 LOBE CENTER AND THIS REALLY HELPS WITH PUMP GAS
PM ME WITH WHAT YOU WANT TO WORK WITH INCHS,ECT AND I'LL GIVE YOU ALL THE HELP I CAN ,,AFTER 30 YEARS I'VE MADE ALOT OF MISTAKES AND LEARNED ALITTLE

paradigm shift

Mbam, The 588 with reliability is what I am looking for. Looking for 800hp range. I here you on the cooling and oiling!

Bobby I will PM you.