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Search: Posts Made By: mcollinstn
Showing results 1 to 25 of 500
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Forum: General Q & A
04-20-2024, 10:46 AM
Replies: 16
Views: 698
Posted By mcollinstn

6k but will cool your cabin, but you'll need to...

6k but will cool your cabin, but you'll need to cool it the night before to get the humidity out. If you keep the cabin door open much during the day it really won't keep up.
10k would be my vote. ...
Forum: Do It Yourself, Boating on a Budget
11-03-2023, 09:00 AM
Replies: 30
Views: 3,743
Posted By mcollinstn

For "fresh" motors, I'm not impressed with the...

For "fresh" motors, I'm not impressed with the compression test results.
was the compression test done after you had run it a few hours to seat the rings?
was the throttle plate fully open when you...
Forum: General Q & A
10-03-2023, 12:14 AM
Replies: 6
Views: 766
Posted By mcollinstn

I don't follow you when you say that more torque...

I don't follow you when you say that more torque (from the engine?) equals less prop pitch.

A boat is not like a car.
Power (Hp) = Torque (ft x lbs) x RPM /5252
If you have ONE hotrod cammed...
Forum: General Q & A
09-30-2023, 07:17 PM
Replies: 6
Views: 766
Posted By mcollinstn

You have to consider that if you have more power...

You have to consider that if you have more power and torque higher in the rev range, you will either need to raise your wide open throttle rpm or go up in prop pitch in order to utilize it. If you go...
Forum: General Q & A
09-30-2023, 06:53 PM
Replies: 33
Views: 3,236
Posted By mcollinstn

Direct Injection doesn't "CARBON UP THE INTAKE...

Direct Injection doesn't "CARBON UP THE INTAKE VALVES".
Recirculating oil vapor from the PCV system into the intake and into the combustion chambers is what "CARBONS THE INTAKE VALVES".
...
Forum: General Q & A
09-30-2023, 06:36 PM
Replies: 3
Views: 483
Posted By mcollinstn

Do "what balance job"? ​​Whomever manufactures...

Do "what balance job"?
​​Whomever manufactures the harmonic damper or flywheel or flexplate balances each unit to a known standard.
Whomever specs out the rotating assembly has the crankshaft...
Forum: General Q & A
09-22-2023, 09:54 PM
Replies: 3
Views: 483
Posted By mcollinstn

The cranks are balanced for the total...

The cranks are balanced for the total reciprocating mass WITH a standard "external balance" flywheel/flexplate and harmonic damper. In other words, "external balance" flywheels/flexplates/dampers are...
Forum: General Q & A
09-21-2023, 01:11 AM
Replies: 25
Views: 1,884
Posted By mcollinstn

With "no vacuum" the springs push the needles...

With "no vacuum" the springs push the needles fully up (rich). Vacuum pulls then down (lean). Spring strength determines the vacuum point where they start lifting.

Generally, at and around idle...
Forum: General Q & A
09-21-2023, 12:54 AM
Replies: 68
Views: 6,281
Posted By mcollinstn

1) There is nothing "wrong" with a MkIV 2-bolt...

1) There is nothing "wrong" with a MkIV 2-bolt main block. But with a 2-bolt block, you are limited to 500hp and 5,300 rpm for continuous duty, even with good cranks and rods. A stroker (496ci) crank...
Forum: General Q & A
09-17-2023, 10:24 PM
Replies: 2
Views: 417
Posted By mcollinstn

There are good flat-tappet cams you can run. ...

There are good flat-tappet cams you can run.
Retro lifters are pricey.
But if you're in for the $$, a hydraulic roller is great.

If you are running a 454/365 then you have a .510 lift 224/224...
Forum: General Q & A
09-17-2023, 09:56 PM
Replies: 25
Views: 1,884
Posted By mcollinstn

Edelbrocks are easy, but you gotta do step by...

Edelbrocks are easy, but you gotta do step by step.

First, we will ASSUME your ignition timing is IN THE BALLPARK for now.

Edelbrock is good w 5 to 8 psi.

If the carb is brand new out of...
Forum: General Q & A
09-17-2023, 08:54 PM
Replies: 68
Views: 6,281
Posted By mcollinstn

The SWAP renders all serial numbers irrelevant. ...

The SWAP renders all serial numbers irrelevant.
with that said, your engine block has a serial number (rear deck surface) and the heads have casting numbers (under the valve covers).
in order to...
Forum: General Q & A
07-16-2023, 12:41 AM
Replies: 3
Views: 335
Posted By mcollinstn

Stamped steel valve cover (MkIV)? Or cast...

Stamped steel valve cover (MkIV)?
Or cast aluminum valve cover (Gen5,6)?
Forum: Do It Yourself, Boating on a Budget
06-23-2023, 08:20 PM
Replies: 14
Views: 2,262
Posted By mcollinstn

All MkIV 502's came with forged pistons. Period. ...

All MkIV 502's came with forged pistons. Period.
I want to say that ALL 502's with Mercruiser badges on them came with forged pistons but there may be some weird combination out there that would...
Forum: General Q & A
05-14-2023, 11:35 PM
Replies: 21
Views: 1,864
Posted By mcollinstn

Some setups use ballast resistors on the coil+...

Some setups use ballast resistors on the coil+ supply line. Coil gets 12v while cranking (from the start terminal on the key switch) and then in the run position the coil sees about 9 volts or so. If...
Forum: General Q & A
04-29-2023, 01:19 PM
Replies: 17
Views: 1,911
Posted By mcollinstn

What the crap is a 500...535 ? I'm not at all...

What the crap is a 500...535 ?
I'm not at all familiar with anything sounding like that. You need to get more details on exactly what this is.

You will never find a 502 block with "less than 502...
Forum: General Q & A
04-29-2023, 11:02 AM
Replies: 17
Views: 1,911
Posted By mcollinstn

With the AFR 265 you still will benefit from bore...

With the AFR 265 you still will benefit from bore notching for flow on a 454.
A 502 (4.47 bore or larger) is large enough that notching doesn't help much
Forum: General Q & A
04-29-2023, 10:53 AM
Replies: 17
Views: 1,911
Posted By mcollinstn

If 525-ish is all you're after then you don't...

If 525-ish is all you're after then you don't need to have a money tree.

Check out this torque-monster 468 build with AFR 265s.

The trick is keeping the squish clearance down around .036-.044"...
Forum: General Q & A
04-29-2023, 01:34 AM
Replies: 17
Views: 1,911
Posted By mcollinstn

MkIV 396-454 blocks are essentially the same -...

MkIV 396-454 blocks are essentially the same - but some have 4 bolt mains. The 2 bolt blocks can be drilled/tapped for 4 bolts, but you have to line bore/hone it.
Early 502's used GM Bowtie thick...
Forum: General Q & A
04-13-2023, 10:46 PM
Replies: 11
Views: 1,796
Posted By mcollinstn

Alpha pumps are perfectly good pumps. I...

Alpha pumps are perfectly good pumps. I definitely wouldn't change to an engine mounted pump.
You have pieces of impeller blades upstream of your pump. You should (with the outdrive lower removed)...
Forum: General Q & A
10-24-2022, 09:30 AM
Replies: 6
Views: 1,033
Posted By mcollinstn

Advance Auto (and probably AutoZone and Oreilly)...

Advance Auto (and probably AutoZone and Oreilly) have rental tools and valve spring removers are one of them.
Forum: General Q & A
10-05-2022, 11:47 PM
Replies: 88
Views: 8,746
Posted By mcollinstn

Stay away from huge cubic inches and monster...

Stay away from huge cubic inches and monster torque, or you'll mangle your outdrive.
A 502/509 is a great combo because the large bore doesnt shroud the valves.
550 hp at 5600 is an easy target....
Forum: General Q & A
10-04-2022, 08:20 AM
Replies: 88
Views: 8,746
Posted By mcollinstn

Incremental improvement is going to frustrate the...

Incremental improvement is going to frustrate the pee out of you.
Drop 2 grand - convince yourself you see 2 mph from it, but you know in your heart that it is more like 1.2 mph.
Drop another 2...
Forum: General Q & A
10-02-2022, 04:42 PM
Replies: 88
Views: 8,746
Posted By mcollinstn

HONESTLY the physics are the limiting factor, and...

HONESTLY the physics are the limiting factor, and the physics cannot be reasoned with or negotiated with. Period.

IF your hull was "40 hp shy" of lifting up onto one more strake or chine, then it...
Forum: General Q & A
09-21-2022, 01:28 AM
Replies: 18
Views: 1,868
Posted By mcollinstn

Yeah. While you are tuning it's very helpful to...

Yeah. While you are tuning it's very helpful to have a vacuum gauge to look at.
Setting idle mix is USUALLY 1/4 turn richer than max vacuum. On a 4-corner carb, adjust all 4 evenly. An HP series...
Showing results 1 to 25 of 500
 
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