Props RevisitedA

[twhrider2]

Hope to get to try the prop this weekend....it was free so thought it would be a good one to start with.

[spareparts]

that 3.7 doesn't mind to lug, if it were an outboard. I'd say prop it out to the top end of the rpm range, but the 3.7L is a torque engine, its doesn't like rpm, teh valve train really doesn't like rpm, prop it out to run around 4200-4500 rpm and you'll be fine. My old roommates 3.7 that I had hot rodded a bit turned 4800 and we had some rocker arm issues from time to time.

[twhrider2]

Thanks for the replies guys....If engine runs out good the rest of summer I have a complete 4 barrel setup to go on this winter along with a set of rollers to tighten up the top end and a little polishing just for sh*ts and giggles. Just more

[twhrider2]

Prop performance on shakedown trip #3.

Prop# 14x21 stainless=3800rpm-30mph.
Prop#2 14.5x17 alum.=4600rpm-33mph.

Guess I will be looking for a 19p now huh?

Also waiting in line at dock this evening and lost forward on shifter..reverse is fine but no forward. Any ideas ? Shifter appears to be original '78. Oh and to make things worse Wifey smoked me fishing today!!! I love it.

[twhrider2]

Picked up a used 19p alum. prop a couple weeks ago and ran great. 4300rpm wot & 36 mph in slight chop in a short run, engine sounded happy.
Bad news- got home checked prop and found a 1" crack in a blade oh well I guess the rompin stompin fire breathing 470 was more than it could stand lolol!!
Watching a couple of Merc. MIRAGE props on e-bay now. Just wondering about any advantage of the PLUS vs standard Mirage?

[spareparts]

the plus has a little more slip than the standard Mirage and has cavitation holes to let it slip more from a stand still. The original Mirage will bog an outboard, where as a Mirage plus works fine on an outboard(thats the whole reason they came out with the Mirage plus)). From the specs you posted using an aluminum prop, I'd say you need a 17P Mirage,

[twhrider2]

Thanks Spare....Now on the hunt for a 17p Mirage.