Proper Prop for CD 28/Volvo MD7A

[warrenescape]

Recently had a lot of work done on the Volvo engine - starts fast and runs strong - but I max out at about 1600 rpm's - I would think it should go up to 2000 - 2500 rpm's - my first thought was prop pitch - so I am checking mine (diver) - wondering if folks know the proper pitch/prop (2 blade)? Thanks - Warren

[Oswego John]

I'm just wondering.

Are you still using the same prop as you used before the engine work was done?

What was the top end RPMs before the engine work was done?

I assume that there is no appreciable marine growth on the prop or hull at this time.

O J

[warrenescape]

The prop is the same as prior to the work being done - I bought the boat in Jan - since I knew it had an overheating problem I did not run the engine north of 1100 RPM prior to the repairs - so I really do not know - have you had experience with the same model engine? If so, what have you experienced regarding RPM range?

Thx - Warren

[DCoulter]

I have same engine and usually top out at about 25-2600 rpm and cruise about 5-6 knots

[warrenescape]

Thanks - do you know your prop size & pitch? Warren

[DCoulter]

I am pretty sure it is original two blade prop, but do not know size and pitch

[Stan W.]

My '79 has a 13 x 13 LH prop. It works well (pushes the boat at hull speed at about 2200 rpms) and I think it is original.

[johnny of STORK]

Stork ('82 30C) has a 13 x 12 3-blade. It will run up to 22-2300, but I almost always run it around 1800 for economy. That pushes her a little over 5 k in flat water.

Johnny