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Search: Posts Made By: mcollinstn
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Forum: General Q & A
07-27-2021, 01:57 AM
Replies: 13
Views: 460
Posted By mcollinstn

Dark oil might just mean you need a good flush...

Dark oil might just mean you need a good flush job.
Before you pull the motor out, do a compression AND leak down test (both with motor warm). Those will help you know where you are starting. ...
Forum: General Q & A
07-27-2021, 01:20 AM
Replies: 22
Views: 868
Posted By mcollinstn

Big heavy boat. Big torquey motors. Wimpy...

Big heavy boat.
Big torquey motors.
Wimpy Bravo drives..
I do not trust them with more than 500 ft lbs of torque.

I've blown up my share of Bravos. I've watched friends throw upgrade after...
Forum: General Q & A
07-27-2021, 01:09 AM
Replies: 45
Views: 2,062
Posted By mcollinstn

There are not several ways to check PTV...

There are not several ways to check PTV clearance. There is only ONE way, although you do have several choices as to which compressible media you use.

The ONLY way to check PTV clearance is to...
Forum: General Q & A
06-30-2021, 12:33 AM
Replies: 33
Views: 1,254
Posted By mcollinstn

Buy fittings here. Take them to your local...

Buy fittings here.
Take them to your local hydraulic hose guy and have them crimped on.

https://www.hydraulicsdirect.com/JIC-37-Female-stainless-hose-fittings-p/ss-hy-fjx.htm
05-29-2021, 11:56 AM
Replies: 6
Views: 338
Posted By mcollinstn

#1 - get a notebook list all baseline...

#1 - get a notebook
list all baseline parameters, list results
every change, list it and list results.

Put a throttle stop right before the secondaries start to open.
Then go jet the...
05-23-2021, 08:58 PM
Replies: 10
Views: 721
Posted By mcollinstn

Back to the basics.. You mention something...

Back to the basics..

You mention something about needing to adjust the timing 8 degrees. Or something like that.

And help me understand what you mean about it "running fine" out of the water....
04-26-2021, 11:14 PM
Replies: 5
Views: 702
Posted By mcollinstn

There is a bracket (usually on an exhaust riser)...

There is a bracket (usually on an exhaust riser) where the cable from the shift lever is connected to an arm that is connected to the cable that goes into the outdrive. Remove the cotter pin that...
Forum: General Q & A
03-13-2021, 10:43 PM
Replies: 42
Views: 2,237
Posted By mcollinstn

1) ALWAYS establish TDC with a piston stop....

1) ALWAYS establish TDC with a piston stop. Adjust the stop out far enough you can't get higher than 15 degrees to top of stroke to improve accuracy. I still have my first homemade piston stop that I...
Forum: General Q & A
02-14-2021, 11:48 PM
Replies: 40
Views: 2,460
Posted By mcollinstn

It's not uncommon for fuel to evaporate out of...

It's not uncommon for fuel to evaporate out of the bowls when it sits a few days.
Buying a shopping cart full of "new carbs" won't change this.

There are 2 ways fuel will "leave" your carb.
1)...
Forum: General Q & A
02-06-2021, 12:50 AM
Replies: 17
Views: 1,387
Posted By mcollinstn

Did you verify the consistency of the center to...

Did you verify the consistency of the center to center lengths of your rods?

Here's what I do during mockup. I put ABCDEFGH on the piston crowns. Then
I put every piston and rod on the #1 crank...
Forum: General Q & A
01-24-2021, 01:56 PM
Replies: 10
Views: 912
Posted By mcollinstn

There are only a few reasons that the 1-piece...

There are only a few reasons that the 1-piece Mercruiser style manifold will crack on you.

1) the manifold flange is warped
2) the flange surface on the head is not flat and needs resurfaced.
3)...
Forum: General Q & A
01-13-2021, 12:23 AM
Replies: 27
Views: 2,338
Posted By mcollinstn

Your cam kit choice is for a Gen5/6 Big block. It...

Your cam kit choice is for a Gen5/6 Big block. It comes with roller lifters that require a D shaped retainer plate. The correct tie-bar lifters are required for a MkIV and are more expensive.

At...
Forum: General Q & A
01-05-2021, 09:28 PM
Replies: 25
Views: 1,523
Posted By mcollinstn

Your stem clearance is normal. If you were...

Your stem clearance is normal.
If you were looking at a high boost motor, the guide material and stem clearance would be more of an issue, as well as the exhaust seat width and face width at the...
Forum: General Q & A
01-03-2021, 04:54 PM
Replies: 25
Views: 1,523
Posted By mcollinstn

4 psi should be plenty safe, even with mid-octane...

4 psi should be plenty safe, even with mid-octane levels. At 4psi, your valves are fine too.
keep total timing under 35.
You are borderline on requiring an intercooler.
If you do choose to add a...
Forum: General Q & A
11-28-2020, 10:22 PM
Replies: 3
Views: 715
Posted By mcollinstn

"MARINE" electronics are spark protected. In an...

"MARINE" electronics are spark protected.
In an enclosed bilge with a gasoline engine, an open spark can ruin your day.
Sierra branded marine solenoids are in the $25 range, so there's no reason...
Forum: General Q & A
11-20-2020, 12:29 AM
Replies: 47
Views: 3,921
Posted By mcollinstn

Might be a good time to drill and tap the LSAB...

Might be a good time to drill and tap the LSAB holes for 6-32 brass set screws that you can drill and change out instead of the pressed-in orifices.

Here's some if the stuff that doesn't sound...
11-11-2020, 09:53 PM
Replies: 128
Views: 12,025
Posted By mcollinstn

Diesels typically have a lot more deck surface to...

Diesels typically have a lot more deck surface to provide a platform for the indicator. The only reason I'm suspect of the data is due to the big difference on intake/exhaust on a couple of them. ...
11-10-2020, 10:03 PM
Replies: 128
Views: 12,025
Posted By mcollinstn

Some of those measurements have got too much...

Some of those measurements have got too much "fixture rock" going on.
1) take a clean file (like a 10"-12" medium mill bastard) without a handle and "flat file" the deck surface to get all traces of...
11-10-2020, 08:40 AM
Replies: 128
Views: 12,025
Posted By mcollinstn

Let your shop know you're running a blower....

Let your shop know you're running a blower. Typically, you will want to run a little thicker seat width on the exhaust side to pull more heat out of the valve. At 5psi, it's not a must, but it's a...
11-08-2020, 01:06 AM
Replies: 128
Views: 12,025
Posted By mcollinstn

Yep. The 731 (168731) is a GenVI. Most guys...

Yep. The 731 (168731) is a GenVI. Most guys reference the "731" and "741" cam grinds, and I guess I do as we'll, sort of like all cola is Coke. To run a 168731 in a MkIV you have to machine the front...
11-06-2020, 10:15 PM
Replies: 128
Views: 12,025
Posted By mcollinstn

Your 454 Mag came with forged TRW pistons. The...

Your 454 Mag came with forged TRW pistons.
The .030 over SpeedPros that are in it now are the correct "cross reference" piston (similar dome, etc to the originals).

I do see that somebody has...
Forum: General Q & A
10-27-2020, 11:41 PM
Replies: 9
Views: 3,300
Posted By mcollinstn

Don't look at engine displacement for your...

Don't look at engine displacement for your comparison. The turbo doesn't know what size the motor is. All it knows is how much air can it push against a given boost load. It's better to compare HP. ...
Forum: General Q & A
10-23-2020, 11:58 PM
Replies: 33
Views: 3,456
Posted By mcollinstn

If you use thick head gaskets to lower CR on an...

If you use thick head gaskets to lower CR on an LS motor, you completely lose the quench turbulence that prevents detonation. You need to keep the squish clearance under .050" and use dished pistons....
Forum: General Q & A
10-11-2020, 06:27 PM
Replies: 22
Views: 1,941
Posted By mcollinstn

I know this is an old post. But if the pan is...

I know this is an old post.
But if the pan is reasonably solid with no rot, you have 2 good options..
I'm assuming you DO know where the leak is?

1) Believe it or not, an internal patch with JB...
Forum: General Q & A
09-23-2020, 10:33 PM
Replies: 63
Views: 15,320
Posted By mcollinstn

A 454 Mag won't blow up at 5500 rpm. It just...

A 454 Mag won't blow up at 5500 rpm.
It just won't benefit you any to spin it that fast. The horsepower peak is around 4800, beyond 5000, you are losing hp.
A camshaft change to something with more...
Showing results 1 to 25 of 42
 


 
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