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Forum: Prop Talk
Today, 12:38 AM
Replies: 1
Views: 18
Posted By Trash

Before you start changing rev limiters and...

Before you start changing rev limiters and cutting more diffuser rings I'd do more testing.

I'm surprised you pulled to the rev limiter with the Rev 4 25" prop. It has significantly more blade...
Forum: General Q & A
11-16-2019, 10:08 PM
Replies: 28
Views: 1,054
Posted By Trash

No it doesn't mean both have a vacuum leak. The...

No it doesn't mean both have a vacuum leak. The high idle motor likely does or the throttle blades/linkage are not working correctly. Fix this engine/problem first, THEN we can address the other...
Forum: General Q & A
11-15-2019, 12:57 PM
Replies: 28
Views: 1,054
Posted By Trash

THIS THIS THIS!! It is a simple fix and not a...

THIS THIS THIS!! It is a simple fix and not a tune issue (assuming it worked previously).

Start with the simple stuff as SB first mentioned. Is the throttle linkage allowing the throttle body...
Forum: General Q & A
11-11-2019, 06:56 PM
Replies: 12
Views: 703
Posted By Trash

Like Baja said perhaps a simple compression test...

Like Baja said perhaps a simple compression test to determine what, if anything, needs attention. 625 hours is not past its time as Griff said. Barring any compression test issues I'd address the...
Forum: Prop Talk
10-21-2019, 09:33 PM
Replies: 35
Views: 1,569
Posted By Trash

Not necessarily true. Blade shape, rake, pitch,...

Not necessarily true. Blade shape, rake, pitch, trailing edge cup and shaft (barrel) length play a larger part.
Forum: General Q & A
10-03-2019, 04:56 PM
Replies: 23
Views: 624
Posted By Trash

It is likely lean. But....do you have the correct...

It is likely lean. But....do you have the correct MAP sensor? i.e. a 1 Bar sensor and not a 2 Bar?

If your motor is indicating lean try solve that issue first. I don't care if you think you have...
Forum: General Q & A
09-30-2019, 05:03 PM
Replies: 7
Views: 389
Posted By Trash

One bank (2/4/6/8 side) but I have an MPI motor...

One bank (2/4/6/8 side) but I have an MPI motor with flow balanced injectors. This is on a standard bore 377 stroker SBC.
Forum: General Q & A
09-29-2019, 10:18 PM
Replies: 7
Views: 389
Posted By Trash

I run 12.8-13.2 in that range. Seat of the pants...

I run 12.8-13.2 in that range. Seat of the pants you likely won't notice anything. At 2000-2600 coming on plane I'm closer to 12.0 then it progresses to 12.8-13.2 around cruise at 2800-3200 rpm. It...
Forum: General Q & A
09-27-2019, 06:22 PM
Replies: 70
Views: 3,029
Posted By Trash

For spark knock it will retard timing until the...

For spark knock it will retard timing until the knock goes away OR it reaches max retard, which is typically around 9 degrees less than programed advance. Advance will return when knock is...
Forum: General Q & A
09-27-2019, 12:55 PM
Replies: 70
Views: 3,029
Posted By Trash

I don't recall all the MEFI 1 power reduction...

I don't recall all the MEFI 1 power reduction modes but I know one is low drive oil. Cuts fuel at about 2500 or 2800 rpm if I recall.
Forum: General Q & A
09-16-2019, 11:19 AM
Replies: 13
Views: 893
Posted By Trash

I'm not sure where you got the 400 lb weight...

I'm not sure where you got the 400 lb weight difference. I think it's closer to 100-150 lbs. regardless, I believe too many people over think the weight issue and under think the torque advantage...
Forum: General Q & A
09-09-2019, 06:53 PM
Replies: 17
Views: 3,393
Posted By Trash

I don't believe they are really meant for dry...

I don't believe they are really meant for dry exhaust. The design uses the water flow directed in a certain manner to dampen the exhaust pulses. Without the water I doubt you'd hear any measurable...
Forum: General Q & A
08-27-2019, 08:10 PM
Replies: 16
Views: 725
Posted By Trash

My apologies if this was in error. I looked at my...

My apologies if this was in error. I looked at my tables and had it backwards. I should not have equated VP110 to AV gas as well. I've tested with VP110 and not AV gas.
Forum: General Q & A
08-27-2019, 12:10 PM
Replies: 16
Views: 725
Posted By Trash

What ECM are you using? The only way to...

What ECM are you using?

The only way to adjust the BPW is by tuning.

If you are tuned for 89, and run AV gas it will be 'rich'. If it is tuned for AV gas and you run 89, it will run lean.
...
Forum: General Q & A
08-26-2019, 06:46 PM
Replies: 16
Views: 725
Posted By Trash

Yes the stoich is higher for AV gas or race gas. ...

Yes the stoich is higher for AV gas or race gas. I've run VP110 and 91 octane and saw the difference. I simply have two different tunes if I need to go back to VP110.

If you can retune the fuel...
08-26-2019, 03:35 PM
Replies: 11
Views: 1,870
Posted By Trash

You will not see any measurable difference in...

You will not see any measurable difference in fuel economy. Throttle response, improved start up and idle control are the main benefits.
Forum: General Q & A
08-25-2019, 12:31 AM
Replies: 25
Views: 1,462
Posted By Trash

Yeah, I didn't pay attention to the year. ...

Yeah, I didn't pay attention to the year. Regardless, this is a fuel issue, and as such I would look at how it is supplied, returned and vented.
Forum: General Q & A
08-24-2019, 02:23 AM
Replies: 25
Views: 1,462
Posted By Trash

This is a classic case of the VST fuel pump...

This is a classic case of the VST fuel pump diaphragm going bad. Check the yellow fuel vent lines off the VST pump assembly. They are likely percolating fuel into the TB or manifold causing your...
Forum: General Q & A
08-17-2019, 12:55 PM
Replies: 23
Views: 943
Posted By Trash

I have to disagree completely. I ran for 16...

I have to disagree completely. I ran for 16 years plus with Rex Marine sound selectors closed 90% of the time and never had a reversion issue. Reversion is more likely with poor exhaust design,...
Forum: General Q & A
08-14-2019, 03:18 PM
Replies: 45
Views: 2,165
Posted By Trash

You might have to play with various washers to...

You might have to play with various washers to clock the intake port into the exhaust stream. It is actually designed to protect from overheat from a turbo application, but works well for errant...
Forum: General Q & A
08-14-2019, 01:13 PM
Replies: 45
Views: 2,165
Posted By Trash

Just for more data I run that extender as well...

Just for more data I run that extender as well and have about 250 hrs of run time on the same O2 sensor.
Forum: General Q & A
08-13-2019, 11:47 PM
Replies: 45
Views: 2,165
Posted By Trash

This is the piece I would recommend too. Made no...

This is the piece I would recommend too. Made no difference in AFR readings either. I did back to back comparison.
08-13-2019, 08:43 PM
Replies: 4
Views: 590
Posted By Trash

I can't speak to where the water dumps out in...

I can't speak to where the water dumps out in these manifolds, but I suspect it is in the vicinity of the blue arrows.

Your spacer as shown with the O2 sensor mounted at the highest point...
Forum: General Q & A
08-07-2019, 04:23 PM
Replies: 4
Views: 266
Posted By Trash

Your data is incomplete. What is the drive...

Your data is incomplete. What is the drive ratio? Is the speed GPS? Without that data it is hard to offer advice.

Assuming the speed is GPS and you have a 1.5 drive ratio the speeds are on par...
Forum: General Q & A
07-29-2019, 01:09 PM
Replies: 16
Views: 1,356
Posted By Trash

I'm running the 165 runner Darts on a a 377. I...

I'm running the 165 runner Darts on a a 377. I would not toss them off the list just yet. You could run them as is or open them up a little if needed. I've gone north of 5500 rpm with those heads.
Showing results 1 to 25 of 500
 


 
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