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Forum: General Q & A
12-07-2020, 12:07 AM
Replies: 10
Views: 771
Posted By Trash

I've run my original MEFI 1 for 25 years and...

I've run my original MEFI 1 for 25 years and literally hundreds of tunes loaded and downloaded. Zero issues, not one. I'm not sure how much more bullet proof it can get.
Forum: Prop Talk
11-04-2020, 08:55 PM
Replies: 7
Views: 518
Posted By Trash

The 1.32 ratio is a tall awkward ratio to use and...

The 1.32 ratio is a tall awkward ratio to use and a 21" aluminum prop is a poor choice. The hub is spun or the blades are merely flattening out. Do not go up in pitch yet. You have no solid...
Forum: General Q & A
10-30-2020, 08:53 PM
Replies: 8
Views: 405
Posted By Trash

It will work for starters. He's not adding 100...

It will work for starters. He's not adding 100 inches of displacement. There are bigger TBI injectors if needed. I would plan on verifying the injectors currently on hand and like others said...
10-14-2020, 01:41 PM
Replies: 16
Views: 941
Posted By Trash

I would suggest thermal expansion could possibly...

I would suggest thermal expansion could possibly be causing either throttle linkage binding (remote chance) or a vacuum leak again due to thermal expansion in a suspect gasket area.

The gasket...
Forum: Prop Talk
10-10-2020, 10:44 PM
Replies: 4
Views: 578
Posted By Trash

You need more rpm. More pitch won't do that. I...

You need more rpm. More pitch won't do that. I would start with a 21" MIrage Plus. Your tach is likely fine.
Forum: Prop Talk
09-20-2020, 04:50 PM
Replies: 6
Views: 590
Posted By Trash

My question would be what rpm are you running...

My question would be what rpm are you running with the 21" Rev 4 at WOT? Are you near or at peak hp / rev limiter?

I like the Rev 4 but it is a lot of prop (blade surface area) and needs hp/tq to...
Forum: General Q & A
09-17-2020, 01:57 PM
Replies: 7
Views: 287
Posted By Trash

And you would likely raise the rev limiter when...

And you would likely raise the rev limiter when tuning to achieve max HP for the cam/head combo built.
Forum: General Q & A
09-09-2020, 12:41 AM
Replies: 10
Views: 619
Posted By Trash

I lost 400 rpm using these slip ins with a 377...

I lost 400 rpm using these slip ins with a 377 inch SBC. They dropped idle noise by 6 dB. The GBB slip ins dropped 6 dB at idle but no loss in rpm (spun the motor about 400 rpm more than with the CP...
Forum: Prop Talk
08-31-2020, 07:30 PM
Replies: 4
Views: 720
Posted By Trash

I would map out the blade area of each 'ear' and...

I would map out the blade area of each 'ear' and compare to your previous set of props. I have templates of all my prop ears as surface area plays a big factor in RPM control, just as much as...
Forum: General Q & A
08-26-2020, 08:42 PM
Replies: 46
Views: 1,644
Posted By Trash

Merc Bulletin No. 94-12 is the bulletin I was...

Merc Bulletin No. 94-12 is the bulletin I was referring too. Can't get it to upload right now.

Your MEFI 3 DOES NOT DO THE SPARK KNOCK TEST on startup. Your timing issue IS NOT FROM 93 octane...
Forum: General Q & A
08-26-2020, 04:20 PM
Replies: 46
Views: 1,644
Posted By Trash

No you do not have that problem. The specific...

No you do not have that problem. The specific issue you are referring to was for a small batch of 454/502 Mag EFI/MP motors around 1994-1995. There was a Merc service bulletin put out at the time...
Forum: General Q & A
08-24-2020, 11:23 PM
Replies: 46
Views: 1,644
Posted By Trash

You bring up a very valid point....but....I have...

You bring up a very valid point....but....I have not viewed the spark map for this particular motor but most Merc tables I have on hand would have more than 15 deg of timing at his stated rpm.

It...
Forum: General Q & A
08-24-2020, 01:54 PM
Replies: 46
Views: 1,644
Posted By Trash

Yes once you pull the clip it will return to...

Yes once you pull the clip it will return to regular timing mode.
08-17-2020, 07:25 PM
Replies: 9
Views: 776
Posted By Trash

You might be surprised that you actually don't go...

You might be surprised that you actually don't go up in pitch that much or at all, but rather you are able to run the same prop at a higher rpm due to where the peak power is now being made. It will...
Forum: General Q & A
08-12-2020, 11:26 AM
Replies: 21
Views: 760
Posted By Trash

You mentioned taking the gas cap off for a bit...

You mentioned taking the gas cap off for a bit helped. Perhaps your tank is not venting and as you draw down fuel the tank vacuum is starving the motor and you are getting a lean pop.
Forum: General Q & A
07-18-2020, 12:03 AM
Replies: 2
Views: 314
Posted By Trash

Lots of injector cleaning services out there will...

Lots of injector cleaning services out there will do a good job. Look for a place that will give before and after data for flow rates and observed spray patterns. They should be flow matched as...
Forum: General Q & A
06-13-2020, 04:08 PM
Replies: 20
Views: 942
Posted By Trash

I will echo what the others have said. Too many...

I will echo what the others have said. Too many people upgrade HP and immediately jump into unknown prop land. Use the original props, get the motors sorted out in the boat, log some good prop data...
Forum: General Q & A
06-04-2020, 10:51 PM
Replies: 6
Views: 624
Posted By Trash

Check and see if the drive lube reservoir has...

Check and see if the drive lube reservoir has lube AND that the sensor isn't stuck. This will usually trigger an alarm and a safe mode where it breaks up like you say around 2000 rpm. If you don't...
Forum: General Q & A
06-04-2020, 03:35 PM
Replies: 11
Views: 747
Posted By Trash

Clean and flow test the injectors. Not saying...

Clean and flow test the injectors. Not saying that will eliminate the problem but is surely due.
Forum: General Q & A
05-15-2020, 09:18 PM
Replies: 87
Views: 7,255
Posted By Trash

I know you work on these a lot, but those intake...

I know you work on these a lot, but those intake manifolds are nothing but acoustic amplifiers for all the valve train noise coming up the runner. I believe what you are hearing is not the lifter...
Forum: General Q & A
05-11-2020, 11:51 AM
Replies: 32
Views: 1,784
Posted By Trash

Do everything they said above. You have a vacuum...

Do everything they said above. You have a vacuum leak due to 1) IAC that may be stuck or hangs up, 2) a true vacuum leak, cracked vacuum line, bad gasket on manifold etc. or 3) check to see that...
Showing results 1 to 21 of 21


 
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