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Search: Posts Made By: MILD THUNDER
Showing results 476 to 500 of 500
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Forum: General Q & A
11-19-2017, 12:06 PM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

A widely-held myth is that maximum advance always...

A widely-held myth is that maximum advance always means maximum power. Here’s what’s wrong with this thinking:The spark plug ignites the mixture and the fire starts burning. The speed of this flame...
Forum: General Q & A
11-19-2017, 11:44 AM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

Max timing not brought in until 525SC = 35*...

Max timing not brought in until

525SC = 35* at 4500 RPM
600SC = 33* at 5000 RPM
800SC = 28* at 5000 RPM

Cruising timing at 3500 RPM approx
525SC = 30
600SC = 28
800SC = 24
Forum: General Q & A
11-19-2017, 09:22 AM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

My question is this. For years, we were told...

My question is this.

For years, we were told that being on the leaner side of things, say cruising with a S/C engine, if you are in the 12.5:1 range, you'll likely hurt it. Or WOT afr's in the...
Forum: General Q & A
11-18-2017, 10:27 PM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

I don't know the reasoning why they did that with...

I don't know the reasoning why they did that with the North star engine. Or should I say , why they needed to do that. Heck , your LS3, my Hemi, they don't run much spark advance at all compared to a...
Forum: General Q & A
11-18-2017, 09:38 PM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

I have a crazy amount of books. Books on...

I have a crazy amount of books. Books on carburetors, cams, ignition systems, superchargers, cylinder head porting, etc. My girl has caught on, and when she goes to the used book store, she comes...
Forum: Do It Yourself, Boating on a Budget
11-18-2017, 06:20 PM
Replies: 40
Views: 25,175
Posted By MILD THUNDER

Comp cams has marine lobes out now, that have as...

Comp cams has marine lobes out now, that have as much or more lift than cranes. They are in their master lobe catalog.
Forum: General Q & A
11-18-2017, 06:17 PM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

Moving on with air fuel ratios and spark advance....

Moving on with air fuel ratios and spark advance.

There is one job of the spark plug. Thats to ignite the intake charge. The job of the ignition system, is to ignite the intake charge, at the...
Forum: General Q & A
11-18-2017, 06:16 PM
Replies: 46
Views: 33,343
Posted By MILD THUNDER

Timing vs AFR vs EGT

Seems like theres alot of questions lately regarding this topic. Things like how much timing to run, what AFR to look for, whats a good EGT, etc. These are my thoughts, which may or may not be...
Forum: Do It Yourself, Boating on a Budget
11-18-2017, 03:43 PM
Replies: 13
Views: 6,235
Posted By MILD THUNDER

I am running the Daytona ignitions. My timing, is...

I am running the Daytona ignitions. My timing, is proportionate to RPM, and Manifold pressure. It varies a bunch depending on those things. Maximum advance on the map I last used, at full boost/wot,...
Forum: Do It Yourself, Boating on a Budget
11-17-2017, 08:41 PM
Replies: 13
Views: 6,235
Posted By MILD THUNDER

I would definitely add some timing in those...

I would definitely add some timing in those cells. And I would do that before upping the boost pressure. I myself, would bump it to 30* there, and work up from there reading the plugs. It looks to me...
Forum: Do It Yourself, Boating on a Budget
11-17-2017, 08:07 AM
Replies: 40
Views: 25,175
Posted By MILD THUNDER

Here some simulations I ran on the cams discussed...

Here some simulations I ran on the cams discussed here on a 496ci with dart 310 flow file. They don't make a 305. I know it's not as good of insight as the golden days of oso, but I'm trying .
Forum: General Boating Discussion
11-16-2017, 10:11 PM
Replies: 17
Views: 3,755
Posted By MILD THUNDER

I have a set up that uses a ball valve to keep...

I have a set up that uses a ball valve to keep water from running out the transom mounted pick up when closed. I hook my garden hose to my freshwater flush, and close the ball valve. The only way you...
Forum: Drives and Lower Units
11-16-2017, 09:35 PM
Replies: 19
Views: 3,729
Posted By MILD THUNDER

drives last longer when they are deeper . Mount a...

drives last longer when they are deeper . Mount a trs even with the bottom on a 38 flatdeck with 900s. Should last a new York minute before they send a mirage plus 100 feet in the air
Forum: Cigarette
11-16-2017, 08:44 PM
Replies: 251
Views: 63,241
Posted By MILD THUNDER

2 out of 3 weren't sealed up so well in your case...

2 out of 3 weren't sealed up so well in your case 😁
Forum: General Q & A
11-13-2017, 05:45 PM
Replies: 17
Views: 2,503
Posted By MILD THUNDER

I have these. They work well at reducing the...

I have these. They work well at reducing the noise when closed.

1212 GAFFRIG SUPERFLO SERIES MUFFLER 4I.D. TAIL PIPE (1-PAIR) INCLUDES PUMP KIT...
Forum: Drives and Lower Units
11-12-2017, 08:41 AM
Replies: 19
Views: 3,729
Posted By MILD THUNDER

Some info ..

Some info ..
Forum: Drives and Lower Units
11-12-2017, 08:27 AM
Replies: 19
Views: 3,729
Posted By MILD THUNDER

From what I know, the #5 lower, has 1 inch thick...

From what I know, the #5 lower, has 1 inch thick spur gears. #4 has .750 thick spur gears. The #4 has a polygon vertical shaft, the #5 has a splined vertical shaft. The #5 has a 1.750 propshaft, the...
Forum: General Q & A
11-12-2017, 08:16 AM
Replies: 15
Views: 2,241
Posted By MILD THUNDER

I'd just bore the minimum to get a round...

I'd just bore the minimum to get a round cylinder. .030 over is the norm. You could even go .010 or .020 over, and custom pistons. I wouldnt go .060 unless mandatory. Those blocks arent like a dart...
Forum: General Q & A
11-11-2017, 07:32 PM
Replies: 58
Views: 20,389
Posted By MILD THUNDER

Something else to keep in mind, a set of...

Something else to keep in mind, a set of stainless marine manifolds , or other similar style manifolds with short runners , will give up around 40hp and 30-40ft lbs of torque in the midrange on a NA...
Forum: General Q & A
11-11-2017, 07:16 PM
Replies: 58
Views: 20,389
Posted By MILD THUNDER

Thats basically the same cam Mike Tkach used in...

Thats basically the same cam Mike Tkach used in that build he was talking about. He said it peaked at 5900 I think.

I try to look at more than the peak rpm horsepower takes place on the dyno...
Forum: General Q & A
11-10-2017, 09:39 PM
Replies: 41
Views: 16,119
Posted By MILD THUNDER

Teagues thoughts. ' Forced induction high...

Teagues thoughts.
'
Forced induction high performance marine engines are hard on cylinder head gaskets. Fight back and prevent torched blocks and cylinder heads with the right marine head gaskets...
Forum: General Q & A
11-10-2017, 09:21 PM
Replies: 41
Views: 16,119
Posted By MILD THUNDER

575sci, 500EFI, 525EFI, all came with the old...

575sci, 500EFI, 525EFI, all came with the old school gaskets at some point. That has now been changed as I stated earlier, and if you walk into a merc dealer, and order a replacement gasket for any...
Forum: General Q & A
11-10-2017, 08:14 PM
Replies: 14
Views: 5,338
Posted By MILD THUNDER

If your looking for the "best", I'd say Weldon...

If your looking for the "best", I'd say Weldon pumps are up there. ''

For a 600HP carb deal, a Mallory 140 pump will get it done.
Forum: General Q & A
11-10-2017, 08:10 PM
Replies: 41
Views: 16,119
Posted By MILD THUNDER

I know quite a few boaters, and pretty rare that...

I know quite a few boaters, and pretty rare that I see anyone running 700+HP supercharged engines, that go 300 hours without a head being yanked off for some reason, to really see how things are...
Forum: General Q & A
11-10-2017, 05:37 PM
Replies: 58
Views: 20,389
Posted By MILD THUNDER

Not bad. Seems about right on par with the 502s...

Not bad. Seems about right on par with the 502s with afr heads and 741 cams I've seem posted here over the years.

I bet a little more cam and it would wake up in the 5400+ range
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