540 bulldog
03-31-2003, 04:34 PM
#1
Registered
Thread Starter
540 bulldog
Happy new owner of a 257 Powerquest with the 540 bulldog. Boat was purchased in TX and it's new home in Utah. The boat is running rich. TX 600' UT 4300', Does anybody have information on re-jetting the carb for my elevation. Called merc, there comment was to change props. That's for hp loss, not for running to rich. Any help is appreciated.
03-31-2003, 04:40 PM
#2
Charter Member #71
Charter Member
Start by going down at least 2 sizes all the way around (Holley???)and do a plug check. I had the same problem boating on Lk Tahoe and Powell. You will ultimately go down in prop size too. NA motors just dont make as much power at high alt's.
Dan
Dan
03-31-2003, 04:56 PM
#3
Registered
Thread Starter
It is a Holley. I do have a good assortment of jets for a 750 Holley, I would think they will work on the 540 carb. On the prop, it is a 23p and looking for a mirage plus 21p for Pine view res. and lake power. The 23p should work great for Lake mead.
03-31-2003, 05:08 PM
#4
Charter Member # 55
Charter Member
A 540ci/500 Bulldog and only spinning a 23" prop
How much does your boat weigh???? Seems to me it should be around 4000-4500lbs and you should be able to/have to run more prop. What are WOT rpms???and mph???
How much does your boat weigh???? Seems to me it should be around 4000-4500lbs and you should be able to/have to run more prop. What are WOT rpms???and mph???
03-31-2003, 08:28 PM
#7
Platinum Member
Platinum Member
iTrader: (5)
Join Date: May 2001
Location: NO WHERE
Posts: 3,358
Likes: 0
Received 0 Likes
on
0 Posts
was it in the texas boattrader, if so was it the one saying runs with the big dogs, or leads the big dogs. im with the others. a 540-should be able to spin a 26 at least. maybe its a 454 w/ 540 decals, did you run the motor #s or did the prev owner just say it has a 540. if so maybe your gear ratio is 1.36 w/ would allow you to run a 23 i think. put on a 25mirage and go from there should be in low 70s there.
03-31-2003, 11:05 PM
#9
Charter Member
Charter Member
Join Date: Oct 2000
Location: Central, Ohio USA
Posts: 1,074
Likes: 0
Received 0 Likes
on
0 Posts
I helped rig a 260 Powerquest with at 540ci/600hp with 1.50 drive. The best we could do was with a 25" labbed Mirage plus prop. It would do 73-74 mph @ 5200. We tried a lot of props and it liked the 3 blade the best, because it raised the bow, not the stern. The engine compartment on the 260 needed more air to breath and I expect the 257 is the same. I expect you will need to run a 23" prop and be in the upper 60s.
The 260 road a lot better in rough water above 70mph than it did at 65mph.
The 260 road a lot better in rough water above 70mph than it did at 65mph.
04-01-2003, 08:41 AM
#10
Bruce and Griff,
keep in mind he's running at 4300 feet elevation. His 470 pshp quickly drops to ~390 hp.
Unfortunatly it's just a fact that we deal with on a daily basis around these parts
Worst part is that this is one of our lower elevation lakes. We run up to 6000+. The motors become very tame so to speak.
Later,
Dave
keep in mind he's running at 4300 feet elevation. His 470 pshp quickly drops to ~390 hp.
Unfortunatly it's just a fact that we deal with on a daily basis around these parts
Worst part is that this is one of our lower elevation lakes. We run up to 6000+. The motors become very tame so to speak.
Later,
Dave
