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Search: Posts Made By: mcollinstn
Showing results 1 to 25 of 500
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Forum: General Q & A
01-06-2026, 09:27 AM
Replies: 33
Views: 3,019
Posted By mcollinstn

A Bravo (even an upgraded one) with over 600 ft...

A Bravo (even an upgraded one) with over 600 ft lbs of input torque is just WAITING for the worst moment to blow up on you.

I have personally blown up stock Bravos with only 450 ft-lbs of input....
Forum: General Q & A
01-06-2026, 09:23 AM
Replies: 33
Views: 3,019
Posted By mcollinstn

Quench clearance.... What is your setup's...

Quench clearance....
What is your setup's quench clearance?
I am talking about the distance from the piston's quench pad to the quench area of the cylinder head.
If your piston pad -to- block...
Forum: General Q & A
01-06-2026, 08:59 AM
Replies: 37
Views: 3,914
Posted By mcollinstn

The MAIN issue in automotive DI engines is that...

The MAIN issue in automotive DI engines is that the "oily mist" from the PCV system is routed back thru the intake, where it "lands" on the hot intake valves and builds up a thick hardened coating. A...
Forum: General Q & A
08-20-2025, 10:10 AM
Replies: 2
Views: 571
Posted By mcollinstn

Any head that comes off of an engine gets...

Any head that comes off of an engine gets blued-up and I run a lapping plate over it to check for anything uneven. You can do the same with a machinists straightedge and shim stock if you don't have...
Forum: General Q & A
07-31-2025, 08:54 AM
Replies: 44
Views: 6,247
Posted By mcollinstn

Well, sort of. But in general speaking, a 8.1/496...

Well, sort of. But in general speaking, a 8.1/496 is a very different beast than an 8.2/502. I would refer to it as a "thirty over GM 8.1".
If you say 496, it could be a MkIV/Gen5,6 stroker 454...
Forum: General Q & A
07-31-2025, 08:46 AM
Replies: 2
Views: 667
Posted By mcollinstn

Carb tuning requires something more definitive...

Carb tuning requires something more definitive than "feels like it might be rich". You need to learn how to read a spark plug and how to do a wide open plug chop.
Forum: General Q & A
07-31-2025, 08:43 AM
Replies: 10
Views: 1,461
Posted By mcollinstn

Verify the accuracy of your compression gauge....

Verify the accuracy of your compression gauge. 135 is what I would expect on a stock 175. My 2.4 ran 160 psi on 93 octane and 180 psi on C14. I find it a little weird that you have CONSISTENT 105 psi...
Forum: General Q & A
06-03-2025, 09:03 AM
Replies: 33
Views: 13,315
Posted By mcollinstn

A fresh engine with properly seated rings should...

A fresh engine with properly seated rings should have MINIMAL blowby. But, YES, a supercharged motor will always have MORE blowby than a NA motor.
1) are your valve covers baffled ? Proper splash...
Forum: General Q & A
05-24-2025, 04:24 PM
Replies: 10
Views: 1,415
Posted By mcollinstn

Hehehehehe.

Hehehehehe.
Forum: General Q & A
04-22-2025, 10:03 AM
Replies: 16
Views: 2,816
Posted By mcollinstn

The Merc 420 has a lot of decent parts in it to...

The Merc 420 has a lot of decent parts in it to start out with. It just doesn't have a lot of compression, and the piston to deck clearance is a little wide to just cut the heads to reduce chamber...
Forum: General Q & A
04-22-2025, 09:51 AM
Replies: 42
Views: 4,724
Posted By mcollinstn

Starter access is USUALLY terrible. I would...

Starter access is USUALLY terrible.
I would think that it would be EASIER to pull the outdrive and see if the squeal goes away.

On my ex-Formula the starters were murder to access the bolts...
Forum: General Q & A
03-03-2025, 08:38 AM
Replies: 3
Views: 908
Posted By mcollinstn

Will bolt up just fine. Will be slightly...

Will bolt up just fine.
Will be slightly higher, and slightly wider.
Forum: General Q & A
02-20-2025, 05:38 PM
Replies: 18
Views: 3,423
Posted By mcollinstn

If you have the fiberglass Silent Thunder...

If you have the fiberglass Silent Thunder swim.platform, you need to know that it has baffles in it. They collect water and burble the exhaust thru it. Taking the baffles out does increase the noise....
Forum: General Q & A
02-20-2025, 05:31 PM
Replies: 6
Views: 1,608
Posted By mcollinstn

Your Scarab will PROBABLY like that +3 extension...

Your Scarab will PROBABLY like that +3 extension box. I don't know your current X dimension but MOST Scarabs came with very conservative (deep) X dimensions. Bringing the drive UP and BACK would...
Forum: General Q & A
06-28-2024, 06:44 AM
Replies: 48
Views: 17,652
Posted By mcollinstn

Qcv4

Qcv4
Forum: General Q & A
06-28-2024, 06:35 AM
Replies: 12
Views: 1,559
Posted By mcollinstn

EVERY SINGLE TIME I opt to pay somebody to...

EVERY
SINGLE
TIME
I opt to pay somebody to do a good professional job/task for me I end up disappointed and full of rage.
I cross my fingers and hope you find a guy who will do a good job for...
Forum: General Q & A
04-20-2024, 10:46 AM
Replies: 16
Views: 1,875
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: 6,505
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: 3,058
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: 3,058
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: 34
Views: 11,601
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: 911
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: 911
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: 5,102
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: 14,070
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...
Showing results 1 to 25 of 500
 
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