Reply With Quotegeno what type of a hull is it? Is it a vee, or a tunnel? But on the other hand does not sound like it's got a bunch of power.
I just bought an 89 Cheetah 210ES it is my first boat. It has the 5.0 with a 1.5:1 ratio and a 19P it only runs at 40-41 mph at 4800 is this normal. Everyone says this was supposed to be a fast boat. Also it has no trim tabs and a 2 barrel carb is it worth adding trim tabs or a four barrel?
geno what type of a hull is it? Is it a vee, or a tunnel? But on the other hand does not sound like it's got a bunch of power.
Its a V it seems like it runs strong. But do you think the trim tabs or 4 barrel are worth it?
Geno,
I would think it should be more in the 55-60 tops with that motor.Not a lot of power ,but 45 is slow. Are you just reading the speedo because it is not that acurate. Tabs wont help with the speed.If you change the carb to a 4 venturi then you need to change the manifold also, it would help with the top end some.
Hey Geno1979, I'm sitting here avoiding work and saw your post and ran the calcs real quick. With a 19" prop turning 4800 rpms, you are running about 52mph with 9-10% slip (theoretically) and with the 5.0 motor on a 21ft vee, you are about right on track. An intake and Carb would give you some improvement, but I'd play with some props first! We had a land and sea torque shift prop on a 19' vee with v-6 with manifold and 4 barrel. Pulled hard out of the hole and would just touch 50-55. Good Luck
Chuck
OOps, almost forgot, if you are pretty sure your speedo is on, get another prop cause that one isn't working for you. :-)
Chuck
Im sure the speedo is close I had my friend with his jet ski clock me. I put a 21P on and it doesnt get out of the hole at all and the rpms won't rise past 4000. Maybe the engine is tired.
Dude if you are turning that 19" to 4800, and only going 41-42 you need to try a different 19". My 19' Galaxie with 350 mag would turn a 4 blade 20" to 4700 but couldn't turn a 23" 3 blade past 4100 so I understand your dilema. That 5.0 might be tired but the prop numbers still don't work with the speed unless you have like 20%+ loss to slip. That's either prop or hull and I never heard of a Cheetah with that low efficency. I'm no expert, but I'd play with another couple props before I went to the engine.
my .02
Chuck
listen closely to Chuck grasshopper Geno....he is masta of squeezing miles per howa from small boat shaped like V
[This message has been edited by Charley (edited May 28, 2002).]
So how do you go about trying to find the right prop is there a method? What should i try doing?
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