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Forum: General Q & A
05-18-2018, 11:50 AM
Replies: 5
Views: 243
Posted By articfriends

back in the 90s and into the early 2000s the...

back in the 90s and into the early 2000s the supercharger companies would sell kits for the stock Motors and just have you jack up the fuel pressure under boost and hope for the best hence fuel...
Forum: General Q & A
05-13-2018, 08:40 AM
Replies: 15
Views: 508
Posted By articfriends

These minimum pw test DO confirm a few suspicions...

These minimum pw test DO confirm a few suspicions and observations ive seen riding around in peoples boats tuning them. Ive chased afrs at really light throttle settings, pw ms numbers were in the...
Forum: General Q & A
05-13-2018, 08:31 AM
Replies: 15
Views: 508
Posted By articfriends

So im sitting here drinking coffee pondering WHY...

So im sitting here drinking coffee pondering WHY these aftermarket injectors way outflow the mercs even though they are supposed to be equal sized. So i just headed out to shop and tryed a couple...
Forum: General Q & A
05-13-2018, 07:23 AM
Replies: 15
Views: 508
Posted By articfriends

Yes, the 500 efi injectors are NOT 32 lb, im...

Yes, the 500 efi injectors are NOT 32 lb, im sure, however, the dead band is in excess of 1 ms and the aftermarket ones much shorter for them to outflow them by so much at every rpm/pw setting on my...
Forum: General Q & A
05-12-2018, 03:33 PM
Replies: 15
Views: 508
Posted By articfriends

My machine is a mid level one, has quite a range...

My machine is a mid level one, has quite a range and adjustability, it does not, however, have a static test for determining size of a unknown one, i can only go by previous test and data from others...
Forum: General Q & A
05-12-2018, 03:30 PM
Replies: 15
Views: 508
Posted By articfriends

I flow and clean them as part of my business,...

I flow and clean them as part of my business, unfortunately when you have "bad"ones , ie, high resistance, low or high flowing etc, if cleaning them doesnt straighten them out, there is no "fixing"...
Forum: General Q & A
05-08-2018, 08:27 PM
Replies: 14
Views: 536
Posted By articfriends

what size jets are in the carb, how did the plug...

what size jets are in the carb, how did the plug in cyl that stuck look?
Forum: General Q & A
05-05-2018, 12:05 PM
Replies: 8
Views: 391
Posted By articfriends

Id rather turn a 28 or 30 w 1.50s than a 32 or...

Id rather turn a 28 or 30 w 1.50s than a 32 or 34, or 24, 26, boats seem happiest w 28 or 30 in my opinion
Forum: General Q & A
05-03-2018, 09:15 PM
Replies: 32
Views: 885
Posted By articfriends

yes, all 02s are as close to equally distanced...

yes, all 02s are as close to equally distanced from head as possible. I dont feel what im seeing is anything new, just no one measured this much till recent past. We'v sll seen Egts vary from high...
Forum: General Q & A
05-03-2018, 09:05 PM
Replies: 32
Views: 885
Posted By articfriends

#7, 8 after a couple lean initial pulls were very...

#7, 8 after a couple lean initial pulls were very lean, slightly sand blasted looking porcelain, strap heat discolored to ring, definately lean. As mentioned top, swapped to dual plane, lean...
Forum: General Q & A
05-03-2018, 08:32 AM
Replies: 32
Views: 885
Posted By articfriends

Exactly, tuned fat AF so between low flowing...

Exactly, tuned fat AF so between low flowing imbalanced injectors over time and lean cylinders it dont blow up. Funny thing is a 500efi tune double fires injectirs, a 502 mpi tune doesn't, i havent...
Forum: General Q & A
05-03-2018, 08:22 AM
Replies: 32
Views: 885
Posted By articfriends

Ss496, your giving mercruiser mefi too.much...

Ss496, your giving mercruiser mefi too.much credit, lol, its blind speed density w batch fire, it basically looks at rpms, map and a knock sensor
Its tuned pig rich from mercruiser, for good reason!
Forum: General Q & A
05-03-2018, 08:02 AM
Replies: 32
Views: 885
Posted By articfriends

Ron, i remember seeing afr spreads of +2 leanest...

Ron, i remember seeing afr spreads of +2 leanest to rich, certain ones started out lean, others rich, matched up somewhat in 4000 to 4800 range THEN flip flopped, rich went lean, lean went rich from...
Forum: General Q & A
05-03-2018, 07:56 AM
Replies: 32
Views: 885
Posted By articfriends

Ss496, yes, i swapped 02 sensors, free air...

Ss496, yes, i swapped 02 sensors, free air calibrated them etc. Plug in #8 when we started out looked mightly lean and lean cylinders moved when we swapped to dual plane. These uneven afrs are...
Forum: General Q & A
05-03-2018, 07:38 AM
Replies: 32
Views: 885
Posted By articfriends

Ron, we put so.much fuel into it w performer to...

Ron, we put so.much fuel into it w performer to try to get #3's afrs below 14 at wot that we drove #2s afrs below 10.5 to point where bsfc was in the .62 range and #2 was breaking up. We thought the...
Forum: General Q & A
05-03-2018, 06:53 AM
Replies: 32
Views: 885
Posted By articfriends

I do know on mefi 3 stuff i tuned w 502 mpi i...

I do know on mefi 3 stuff i tuned w 502 mpi i closed up the afr gap even though you cant tweak individual cyl fiel trims by double firing the injectors vs once per 4 cycle revolution
Forum: General Q & A
05-03-2018, 06:41 AM
Replies: 32
Views: 885
Posted By articfriends

The problem with that Joe is to get those hot...

The problem with that Joe is to get those hot cylinders into the mid 12s you've got other cylinders below 10 5
Forum: General Q & A
05-03-2018, 06:17 AM
Replies: 32
Views: 885
Posted By articfriends

https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20180426_143409_a1c382e0200109b3f178dbb721e6b805addb9cdb.jpg
Forum: General Q & A
05-03-2018, 06:14 AM
Replies: 32
Views: 885
Posted By articfriends

Average tail pipe readings, these are numbers...

Average tail pipe readings, these are numbers were used to seeing, tune for 12.5 lets say, motors usually "safe" , ive known for long time that AVERAGE number can get a guy in trouble in a endurance...
Forum: General Q & A
05-03-2018, 06:05 AM
Replies: 32
Views: 885
Posted By articfriends

So, ive been on alot of dynos in my life before...

So, ive been on alot of dynos in my life before owning one, most had egts, none had individual 02 sensors ,wasnt uncommon to see same lean cylinders in the high 1300's, even low 1400's and rich/cold...
Forum: General Q & A
05-03-2018, 06:00 AM
Replies: 32
Views: 885
Posted By articfriends

So i wanted to see where numbers goe w intake...

So i wanted to see where numbers goe w intake swap to dual plane. We swapped on a old school performer 2.0, sum things up, just shifted lean afrs to differemt cylinders, made 20 to 30 more ft lbs tq...
Forum: General Q & A
05-03-2018, 05:51 AM
Replies: 32
Views: 885
Posted By articfriends

So, guy who owns/built this motor created a mis...

So, guy who owns/built this motor created a mis matched combination with this vic jr intake, totally in appropraite cam etc, yes, these intakes suck unless you are rpming the **** out of something or...
Forum: General Q & A
05-03-2018, 05:46 AM
Replies: 32
Views: 885
Posted By articfriends

I previous saw a 3 to 3.5 spread in afrs on.my...

I previous saw a 3 to 3.5 spread in afrs on.my 548 when dynoing carbed with various open plenum intakes, was able to get wot numbers in high 12'w enough stagger jetting, adjusting on carb etc and...
Forum: General Q & A
05-03-2018, 05:42 AM
Replies: 32
Views: 885
Posted By articfriends

So, begin dynoing this, 17-1 on #7/# 8, 12.5 ish...

So, begin dynoing this, 17-1 on #7/# 8, 12.5 ish on coldest, drops down to mid to high 15's by end of pull, coldest cylinders in sub 12 range. NOT a carb problem, stagger jetted , high speed bleeds,...
Forum: General Q & A
05-03-2018, 05:35 AM
Replies: 32
Views: 885
Posted By articfriends

Maximum afrs in individual cylinders

Heres a question for those in the "know", what is the real world, safe maximum lean afr # a bbc motor can live with at sustained high speed? Yes, I KNOW what tailpipe target readings to use. I...
Showing results 1 to 25 of 500
 


 
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