Thread: Remember this guy...
02-05-2008, 09:28 PM #1
Remember this guy...
Darth, is this something like the engine you have?
Posteddocument.write(''+ myTimeZone('Thu, 12 Aug 2004 08:13:31 GMT-0700', 'August 12, 2004 11:13 AM')+''); August 12, 2004 12:13 PM Hide PostBest I've seen GPS is 75.0 in 8" chop.
Consistently running 73.6 on glass with current setup.
R&D/Lamey Powervalve 66U cylinder. Gas powervalves.
85mm bore, wiseco Kawasaki flattops.
77mm welded stroker. CR500 rods.
Protec girdled head. 23cc domes. 225psi.
Tassinari double row reeds. R&D intake.
Ported block. intake spacer. 48 Novis.
MSD total loss, 17 degrees retard. 8500rpm limit.
1997 GP760 hull.
Skat E-155 Magnum 12 vein. 16-23 Swirl. SeaDoo oil in pump. Short cone.
5 degree nozzle bored to 88mm. Riva long steer nozzle.
Aquavein intake. Protec plate. Riva sponsons. Billet tabs.
118 octane and 32:1 maxima 927.
First 6 hours were trouble free, then lost the head O rings. New O rings didn't last because the helicoils pulled out of the jug.
Not very reliable so far.
I am lowering compression though to 205, and taking a little retard out of it. I expect reliability to improve. Never got a chance to do much experimenting with plates intakes nozzles and such. Stringers are cracked so fall/winter will be hospital time for the old goose.
So far, all "experts" that have seen the boat run in person have been amazed at its speed. Especially since the hardware is set up for acceleration and hookup. And I assure you that it does accelerate violently. Or at least it did when it was running...
02-05-2008, 11:16 PM #2
wow and i thought my 185-190 compression was high- dang!!
02-05-2008, 11:56 PM #3
02-06-2008, 10:20 AM #4
J-ME , That is basically the same as mine.
I don’t know why anyone would have head problems on these cylinders, they are very thick and don’t need a girdle. If the cracked chambers were leaking water that will lift a head. I feel lucky to have a new one (twelve hours on it) and TJ started it out with studs, so no pulled threads. It came with two sets of domes 215 and 185, I’m starting out with lower compression. But these numbers are with the valves closed at, 5000 rpm they open and drop it to about 160#
Last edited by Darthraider; 02-06-2008 at 01:20 PM.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Shibby1485 in forum Sea Doo Open DiscussionReplies: 7Last Post: 04-24-2006, 09:25 PM
By Yuji in forum Sea Doo Open DiscussionReplies: 7Last Post: 04-20-2006, 07:57 AM
By Franko in forum Sea Doo Open DiscussionReplies: 9Last Post: 03-25-2006, 02:48 PM
By BertInTexas in forum Sea Doo Open DiscussionReplies: 0Last Post: 08-19-2005, 08:23 PM