Scarab 22 Performance comparison
#1
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Scarab 22 Performance comparison
Hi to all,
can anyone please suggest his point of view to the subject?
98 Scarab 22 big block engine (7.4 GI Volvo Pento 800hours) + with CMI headers + antifouling paint + 25 BBLade (4 blade high rake propller) shows poor performance (67 mph with gaffrig water pickup speedometer).
Engine compression ok.
Fuel injection system ok.
What kind of performance should i expect from this boat?
What would be the best idea of upgrade or ardjust?
Thanks in advance
can anyone please suggest his point of view to the subject?
98 Scarab 22 big block engine (7.4 GI Volvo Pento 800hours) + with CMI headers + antifouling paint + 25 BBLade (4 blade high rake propller) shows poor performance (67 mph with gaffrig water pickup speedometer).
Engine compression ok.
Fuel injection system ok.
What kind of performance should i expect from this boat?
What would be the best idea of upgrade or ardjust?
Thanks in advance
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because it was doing 70mph with stock engine and without any paint bottom...
which propeller are you using?
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I had a 96 22 Scarab. With a 7.4MPI LX (330 hp) I hit a best of 70.6 GPS. Put in a 502 MPI (415hp) and hit a best of 74.1 GPS. No bottom paint and running a labbed 25P Mirage Plus. The boat was as clean as they come and ran it for many years. I learned a lot driving that boat faster than I should of in rough water. A blast to drive.
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I think that is pretty good, esp with bottom paint.. With out the paint I wouldn't doubt a 69-70 mph pass from it...
What rpm are you turning with that prop...??
John jr
What rpm are you turning with that prop...??
John jr
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Thanks for all the comments,
now it is turning 4250 rpm, if i try to trim up more, the propeller starts spraying but no speed up at all...
do you think i should try on a mirage 25?
What is the optimum rpm of my 7.4 gi engine at top speed?
THanks
now it is turning 4250 rpm, if i try to trim up more, the propeller starts spraying but no speed up at all...
do you think i should try on a mirage 25?
What is the optimum rpm of my 7.4 gi engine at top speed?
THanks
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I'm running 25" Mirage, but my boat is a totally different animal compared to yours.
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I believe the main problem with the boat is what ever i do the boat`s hull has too much friction in the mid part (it does not matter how much trim up the boats bow does not come up as much as it should have) it goes more like a train in the water,
what could fix this problem?
More horsepower?
Different Prop? if yes which one?
to modify the hull?
to change the transom location?
thanks in advance
what could fix this problem?
More horsepower?
Different Prop? if yes which one?
to modify the hull?
to change the transom location?
thanks in advance