OMC reed test results (non race)

[specboatops]

Sounds good Jay, guess I missunderstood your comments or at least part of them, it came across to me as though you were defending something that the test proved different. As stated in the thread I meant no dissrespect, you've always answered any question on here quickly and accurately.....have helped a bunch of folks in which you gained nothing but being able to answer a question and help.


Chris

[Laker]

THANKS AL!
These tests are simply excellent!!
Any thoughts on doing dyno tests on other engine components?
Awesome stuff!!

[racer]

Powerabout,
Dyno records every 100 rpm the results are average over the stated range except for peak torque. graphs were very close as the numbers would indicate.

[mrcrsr]

how about testing without the reed stops, i wonder if thats what made the boyessens better?

[ChrisCarsonMarine]

The boysens use a 015 top leaf,thAt helps at higher rpms

[400hpV8johnrude]

So why dont cc or tdr make a similar 2 stage reed w a .015 top out of there better material? the patent has expired hasent it?

[ChrisCarsonMarine]

Single stage works better in my opinion,remember we sent yellow sport reeds not race or drag reeds,which are cut differently and use different material,chris

[hydro]

Al,

Could you comment on BSFC as it pertains to your reed tests.

Thankyou

[jphii]

So why dont cc or tdr make a similar 2 stage reed w a .015 top out of there better material? the patent has expired hasent it?

Single stage works better in my opinion,remember we sent yellow sport reeds not race or drag reeds,which are cut differently and use different material,chris

I've got a couple of sets of CCMS .015 drag reeds. Me likey

[Laker]

Could you comment on BSFC as it pertains to your reed tests.

Here is a good write up on the subject

http://www.land-and-sea.com/dyno-tec...using_bsfc.htm

[SSRACER]

Really a cool test with allot of info. The Boysen reeds Are .018 top and .020 bottom. If Al had lowered the high-speed jet one size you would have seen even more HP on the Boysen test. Just looking at the EGT's. (One Jet Size on an OMC is about 20-40 deg) Anyway cool test thanks for doing it.

[racer]

One jet size will make more than 40 degrees on this engine. The piston tops were a nice brown with NO wet areas. Some engines like to run hotter than others this one is not one of them. The EGT was shown just to show all reeds were kept close to one another. Remember this was on straight race 110 when the engines compression would have been capable of running on a mix.

[SSRACER]

After some thought I came up with I don't run V-stacks really makes the tune up tuff. I also have never been in the same state with a dyno, just have the old fashioned race boat. Generaly race gas on my boat makes the changes in deg. vs jet size even smaller. I don't think 1070 is fat I always thought it kinda matters how the engine is loaded...I wasn't second guessing you just had a thought ...Lots of ways to skin a cat..

[MrG]

Now how about a carbed 3.3 ltr with Dave bush sleeves …… on one of those pulls