DUI and Acme prop

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   Thought I might chime in with my success yesterday after installing my DUI from Performance Distributors and a new Acme prop.  Unfortunately, my results arent fully documented as I never had the chance to check the timing with my stock distributor before my ignition module quit.  The motor is stock (with the exception of the DUI), 240 horse 351w with the 1.23:1 Power Plus transmission.  I havent calibrated the speedos, but they should be pretty close.  

With the new DUI, I set my base timing to about 14 degrees and made a few small carb adjustments.  Doesnt start hard or ping under load.  Picked up 200 RPM and 1 MPH on the top end (42 1/2 @ 4400).  Felt very strong.  

Added an Acme #470 prop, gained another 200 RPM and 1 MPH on top of that (43 1/2 @ 4600 RPM according to my speedo).  Felt smoother throughout the range and the boat really jumps out of the hole.  

Overall, a big improvement as I was only getting about 41 MPH @ 4200 RPM with the stock distributor and 4-blade OJ.  I havent opened up my plug gaps yet (Performance Distributors recommends .050" - .055" gap).  Ill report back with any changes once I do.

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TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21186	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Topic: DUI and Acme prop Posted: April-30-2006 at 7:28am
	Thought I might chime in with my success yesterday after installing my DUI from Performance Distributors and a new Acme prop. Unfortunately, my results arent fully documented as I never had the chance to check the timing with my stock distributor before my ignition module quit. The motor is stock (with the exception of the DUI), 240 horse 351w with the 1.23:1 Power Plus transmission. I havent calibrated the speedos, but they should be pretty close. With the new DUI, I set my base timing to about 14 degrees and made a few small carb adjustments. Doesnt start hard or ping under load. Picked up 200 RPM and 1 MPH on the top end (42 1/2 @ 4400). Felt very strong. Added an Acme #470 prop, gained another 200 RPM and 1 MPH on top of that (43 1/2 @ 4600 RPM according to my speedo). Felt smoother throughout the range and the boat really jumps out of the hole. Overall, a big improvement as I was only getting about 41 MPH @ 4200 RPM with the stock distributor and 4-blade OJ. I havent opened up my plug gaps yet (Performance Distributors recommends .050" - .055" gap). Ill report back with any changes once I do.

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21186	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Posted: May-01-2006 at 10:41am
	Quick update: I opened up my plug gaps to about .056" yesterday. Gained a touch more RPM, maybe 50. Very happy with the results this weekend!

tjackle Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: September-30-2005 Location: United States Status: Offline Points: 60	Post Options Post Reply Quote tjackle Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 9:51am
	Is your motor a LH rotation?
	78 Nautique If you're going to do it... Do it in a boat

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21186	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Posted: May-02-2006 at 10:31am
	Yup, its a standard rotation motor. The rotation direction is reversed in the 1.23:1 tranny, so the boat runs a RH prop.

DUI and Acme prop

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