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Search found 209 matches

by CharlieB53
Fri Dec 27, 2019 12:13 pm
Forum: Engine Tech
Topic: Reputable links for horsepower from windage tray/crank scraper
Replies: 255
Views: 11173

Re: Reputable links for horsepower from windage tray/crank scraper

I have to wonder if we could construct a screened blanket that would form fit about 2/3 around the crank Assyrian so as to capture most all the oil flung off this wicking the oil away rather than allowing droplets to ricochet back into the violent air currents. If crankcase space allowed such screen...
by CharlieB53
Sat Dec 07, 2019 12:05 pm
Forum: Engine Tech
Topic: I am in need of some camshaft help.
Replies: 15
Views: 1277

Re: I am in need of some camshaft help.

Would it be worthwhile to coat the exh valves ?
by CharlieB53
Sat Nov 16, 2019 7:29 pm
Forum: Engine Tech
Topic: Rod Bolt Strength / Requirements
Replies: 10
Views: 2193

Re: Rod Bolt Strength / Requirements

Tell me more about improving the gm bolts.
by CharlieB53
Sun Nov 03, 2019 10:50 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 120
Views: 4595

Re: Low speed (1500-1800 RPM) driveability issue

The root cause of the low speed issue is the slow air velocity at minimal RPM. Fuel droplets will fall out causing some cyl To go lean and the wet intake floor can cause other cyl to go rich. Try installing metal window screen sandwiched with gaskets under the 4 hole spacer. This will force fuel dro...
by CharlieB53
Sat Oct 19, 2019 11:05 am
Forum: Forum Help / Questions / Tips
Topic: Log in iPhone problems
Replies: 1
Views: 100

Log in iPhone problems

iPhone doesn’t like to log in, takes multiple attempts before success.

Once logged in usually drops out with most every page change.

Very frustrating.

This is third attempt to post problem as it drops out again before it makes the post.
by CharlieB53
Sat Oct 12, 2019 2:27 pm
Forum: Engine Tech
Topic: Idea for pre lubing oil galleries
Replies: 34
Views: 3007

Re: Idea for pre lubing oil galleries

I’ve thought long ago but never got around to doing it. An elec pump T’d into the oil filter adapter and a Merphy switch such that the pump comes on with the key near immediately pressurizing the oil system to a minimum psi. Crank and start and as the engine oil pressure rises the Merphy turns off t...
by CharlieB53
Sun Sep 29, 2019 9:23 am
Forum: Engine Tech
Topic: Service Life of Steel H-Beam Rods
Replies: 31
Views: 1635

Re: Service Life of Steel H-Beam Rods

No doubt mic’ing rod bolts should indicate any change in length suggesting eminent failure the same may be true with rod length.

I don’t have the tooling to measure accurate rod length but I’ sure someone does. The cost could be well worth the peace of mind.
by CharlieB53
Sat Sep 21, 2019 6:48 pm
Forum: Engine Tech
Topic: Fuel Requirements
Replies: 40
Views: 1229

Re: Fuel Requirements

In the marine world a general rule of thumb is fuel required equals 10% of HP.

Like fbird said, 420 HP generally requires 42 gph gasoline.

Your mileage may vary.
by CharlieB53
Wed Sep 18, 2019 11:26 am
Forum: Engine Tech
Topic: Are Exh pushrods more stressed even in NA applications?
Replies: 35
Views: 1601

Re: Are Exh pushrods more stressed even in NA applications?

Would it be advantageous to grind ex valve/seat to maximize low lift flow?

Intake angles for high lift flow?

Is this already a common practice?
by CharlieB53
Wed Sep 11, 2019 2:34 pm
Forum: Engine Tech
Topic: another blown up jetboat motor sbc
Replies: 16
Views: 1259

Re: another blown up jetboat motor sbc

WOT of 4700 is way too tight on the pump clearance, over loading the motor causing premature failures.

Loosen pump to get closer to 5500 and it should perform well and last much longer.
by CharlieB53
Tue Sep 10, 2019 4:57 pm
Forum: Engine Tech
Topic: another blown up jetboat motor sbc
Replies: 16
Views: 1259

Re: another blown up jetboat motor sbc

I’d liked to have seen the valves from the prior failures, perhaps would know more if it was the valve head or keeper failed.

3800 cruising? What was the WOT rpm set by the pump clearance? To tight on the pump can overload the motor creating excessive exhaust valve heat.
by CharlieB53
Tue Sep 10, 2019 10:54 am
Forum: Engine Tech
Topic: Oil on #4 Plug
Replies: 13
Views: 711

Re: Oil on #4 Plug

While the intake is off check the gasket surface with a straight edge .
by CharlieB53
Sat Sep 07, 2019 12:29 pm
Forum: Engine Tech
Topic: Camshaft help
Replies: 17
Views: 1504

Re: Camshaft help

No doubt valve springs are required for rpm but I have a question for the cam guys.

With a lift limit would it make sense to increase cam diameter so as to enable increasing duration in the lobes.

Is there even room in an abc for a larger cam bore?
by CharlieB53
Sat Sep 07, 2019 12:01 pm
Forum: Engine Tech
Topic: Oil on #4 Plug
Replies: 13
Views: 711

Re: Oil on #4 Plug

Can you do a clean shut off then pull the plug and inspect for oil? Compare that to pulling the plug immediately after decelerating and high intake vacuum. High vacuum on deceleration may be pulling oil past intake asker yet not leaking enough at wot to show a problem yet. Have heads/intake surfaces...
by CharlieB53
Tue Aug 27, 2019 10:57 am
Forum: Engine Tech
Topic: Quench safety distance for a 496 MAG gen 7 BBC
Replies: 12
Views: 866

Re: Quench safety distance for a 496 MAG gen 7 BBC

OP didn’t mention RPM this BOAT engine is operated. Generally rod stretch becomes a critical factor with increased RPM, however in the marine application and somewhat less rpm extremes a tighter squish may be allowed. I wouldn’t get extreme, but set up far closer to minimum should still be well acce...