Reeds

[Forkin' Crazy]

I find it very strange that the most important post in the entire 8 page thread is missing.

But, never fear, ole Forkin' saved it on his computer!!!

OMC reed test results (non race)

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First a little about the engine used for the test, it is a 183 cubic inch production based engine basically built to ODBA pro carb rules minus compression and a modified intake. It was tested with 155 psi compression and untouched intake manifolds, reed cages were lapped for inproved seal. Stock factory ignition except for a race flywheel. Mid section used was stock except for water routing needed for dyno use.

Dyno is a superflow with windyn data, room is about 12X18. Exhaust is thru a large muffler (city req.) and water supply from a 10K gallon tank, I thus can control water feed in volume and pressure to the engine cooling. Air parameters for the test were very close.

A base line beyond test parameters was established before the high compression heads and modified intake were removed, in this trim it made 400.5 horsepower after testing was complete it was retested to verify condition of engine and it made 399.4. After each reed test compression and leakdown were performed and they remained very consistent. If a test was done on a different day, the previous test was rerun to verify accuracy, no change more than .5 horsepower was noted.

Tests were run using 110 race fuel and 40 to 1 oil. Tests were controlled to the best of my ability including engine temp, I am including one run at a lower temp so you can see the difference it makes. All reeds were cycled thru different rpm ranges to verify reed durability, then a minimum of three pulls were performed.

First reeds tested stock prodution steel reeds with stops.
Peak torque 286.9 @5800
Average from 6000 to 7500
Torque 264.6 HP 338.8 Pounds fuel hour 197.7 BSFC .606
Average from 6500 to 7500
Torque 258.8 HP 343.6 Fuel 191.2 BSFC .577
Engine temp 128 degrees Horsepower fall off from peak to 7500 -19.6HP
EGT 1090

Second reeds Boysen 166 no stops
Peak torque 298.3 @5500/5800
Average from 6000 to 7500
Torque 275.2 HP 352.8 Fuel 212.7 BSFC .625
Average from 6500 to 7500
Torque 269.1 HP 358.2 Fuel 207.2 BSFC .599
Engine temp 129 degrees HP fall off peak to 7500 -4.2HP EGT 1070

Third Chris Carson .022 yellow with stops at 128 degree temp
Peak torque 283.2 @5600
Average from 6000 to 7500
Torque 264.1 HP 338.5 Fuel 196.6 BSFC .603
Average from 6500 to 7500
Torque 258.9 HP 344.5 Fuel 196.6 BSFC .592
Fall off 14.8 Hp EGT 1090

Same reeds at 119 temp
Peak torque 288.2 @5700
6000 to 7500
Torque 267.7 HP 343.2 Fuel 191.8 BSFC .577
6500 to 7500
Torque 262.4 HP 349.3 Fuel 192.4 BSFC .569
Fall off Peak to 7500 -11.6 EGT 1090
So you can see temp also effects these engines

Fourth TDR .022 white with stops
Peak torque 291.2 @5600
Average from 6000 to 7500
Torque 267.8 HP 343.2 Fuel 202 BSFC .615
Average 6500 to 7500
Torque 261.9 HP 348.4 Fuel 198 BSFC .591
Engine temp 126
Fall off peak to 7500 -7.8 EGT 1090

Of note,
All averages done by the computor, accel rate same for all and controlled by the computor at 600 rpm gain per second
All reeds in tack after test but Boysen had a few slightly open, causing a slight spit on restart
Best idle quality and starting Carson and TDR
Loudest intake noise Boysen

I am going to try and test thinner race type reeds on cut cages once I get some time including some sent that did not meet this tests parameters, one already tested. The above are reeds that should live well in every day use. Pictures to follow in a few days.

I would like to thank both Tony and Chris for their participation in this test. Total time involved 16 Hours two guys, fuel burned to much.

[Instigator]

You rock my Brother! Spent 20 mins trying to clean mine up so you could read it w/no success.

[Forkin' Crazy]

Al Stoker spent way too much time and money on this project for this to just disappear. I am surprised and a little bothered that the KEY post went "POOF".

Thank you again Al Stoker (racer) all for your restless dedication! We all appreciate it!

PS I copy a lot of stuff!

[Instigator]

Al Stoker spent way too much time and money on this project for this to just disappear. I am surprised and a little bothered that the KEY post went "POOF".

Thank you again Al Stoker (racer) all for your restless dedication! We all appreciate it!

PS I copy a lot of stuff!

Couldn't have said it better Paul. And I copy the good stuff too

[Superbender]

Jay didn't mean to get your panties in a wad,thats a great offer.
Forkin that a good save thanks,a lot work went into that would have been a shame to loose it

[lokinutz]

Al Stoker spent way too much time and money on this project for this to just disappear. I am surprised and a little bothered that the KEY post went "POOF".

Thank you again Al Stoker (racer) all for your restless dedication! We all appreciate it!

PS I copy a lot of stuff!

Strong work!

And, couldn't agree more.

[Jay Smith]

Superbender,
At 60 years old it would take a lot more than a post on a forum to raise my Blood Pressure ! Too busy building motors and installing TDR reeds LOL.... But thanks for the concern.. Try a set of TDR's you'll be glad ya did..

Jay

[Markus]

I'll stick with my Boyesens. They've never let me down.

We have run Boyesens and TDRs side-by-side.

TDRs last a lot longer...

[rev.ronnie]

On my HST, I noticed that when I switched my Boysens to CCMS .022" reeds and his 1" spacer, I had to bump the idle mixture on the ACU richer as well as the sensitivity and compensation adjustments as well. 4-6% on all three.

After the change, it wouldn't really run through the no wake zone from the launch without bumping the enrichener. Trying to get it on plane, I had to do the same. Two quick adjustments and it's almost there. I just have not had time to play with it any more.

So far so good. The real test for me will be how well it pulls over 7500.

I will post results when I play some more.

[Lockjaw]

Well I have never put a set of boyesens in a motor and not seen an improvement in idle quality and punch. But I used them in OMC's so, your results may vary. The ones that came out of my eagle motor looked good to me, so they went into my franken eagle project motor. So far so good.

Since these are on rubber coated ficht cages, they should last forever.

[ChrisCarsonMarine]

Ronnie,your running lean for two reasons
1. You are getting more air...
2. The air is staying in the crankcase,and less is refluxing back into the airhorn,carrying fuel with it,richening the mixture by causing the motor to re-breathe air with some fuel already in it.Same applys to a carb motor,the airbox traps one cylinders reflux,and then the cylinder next door sucks it in,and in turn spits a little out...the better the reeds flow and seal the leaner the mix,Chris

[rev.ronnie]

Ronnie,your running lean for two reasons
1. You are getting more air...
2. The air is staying in the crankcase,and less is refluxing back into the airhorn,carrying fuel with it,richening the mixture by causing the motor to re-breathe air with some fuel already in it.Same applys to a carb motor,the airbox traps one cylinders reflux,and then the cylinder next door sucks it in,and in turn spits a little out...the better the reeds flow and seal the leaner the mix,Chris

I talked to Tony Brucato and he said the same.. It is probably creating more vacuum now too.

I am using the Boysen hold downs with no stops, is this correct Chris?

I'll tell you one thing; that thing cold starts now better that it ever did. It used to be a real pain, especially at a packed launch, looking like a newb trying to start it.

[ChrisCarsonMarine]

The stock ones are a little thicker,boys are thinner because with both layers you have around .050 in reeds stacked up,they needed the thinner plates to get them to fit... It'll most likely be ok,Chris

[rev.ronnie]

The stock ones are a little thicker,boys are thinner because with both layers you have around .050 in reeds stacked up,they needed the thinner plates to get them to fit... It'll most likely be ok,Chris

Thanks, that's what I figured. If they are thick enough to support that two stage, convoluted mess with the fiber strips and all with the Boysens, they should hold yours down..

[Capt.Insane-o]

We have run Boyesens and TDRs side-by-side.

TDRs last a lot longer...

I've never had a set of boysens seal properly after 4-6 hours no matter who prepped the cages. I think I'm going 5-6 years on my TDR sets now... I've recently got some of Chris's reeds in some smaller motors but have been too busy to run them.