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by John Fenner
Wed Oct 28, 2020 12:45 pm
Forum: Prop Talk
Topic: Best diameter 5-blade Warp Drive for 220GPU?
Replies: 2
Views: 303

Re: Best diameter 5-blade Warp Drive for 220GPU?

Cut damaged tips equal length, set pitch to desired rpm, wouldn't suggest under 68" diameter.
by John Fenner
Wed Oct 14, 2020 4:43 pm
Forum: Airboat Talk
Topic: Compression lock replacement?!
Replies: 3
Views: 317

Re: Compression lock replacement?!

Here ya go.
by John Fenner
Wed Oct 14, 2020 1:22 pm
Forum: Airboat Talk
Topic: Sunk Airboat
Replies: 5
Views: 711

Re: Sunk Airboat

Drain oil, fuel pull all plugs, will need to have starter and alternator and all wiring replaced, magnetos will need rebuild, ok now, fill sump with fresh oil, doubtful that starter will work, but try it, need to spin it over and get oil pressure with plugs out, drain out carb, flush with fuel, you ...
by John Fenner
Wed Oct 14, 2020 1:14 pm
Forum: Airboat Talk
Topic: Compression lock replacement?!
Replies: 3
Views: 317

Re: Compression lock replacement?!

Aircraft spruce has them, will try to remember to post part number when I get home.
by John Fenner
Sat Oct 03, 2020 7:30 am
Forum: Aircraft Power Only
Topic: Pacemaker Settings
Replies: 10
Views: 941

Re: Pacemaker Settings

Ok, I searched this thread for a reason, get this,,, a Jurnigan built Parallel valve O-540, spinning a,,,,, ready for this? 70" Sensenich 5 blade at an average of 7.5° as the pitch is all over the place, varying from 8 to 7° only 2700 RPM, I told the kid that either his engine is real tired or the p...
by John Fenner
Sat Oct 03, 2020 7:05 am
Forum: Aircraft Power Only
Topic: Pacemaker Settings
Replies: 10
Views: 941

Re: Pacemaker Settings

One coil, 2 plugs to fire, 1 plug fires say cylinder 1 on compression stroke, and other fires cylinder 2 on exhaust stroke, coil packs and driver determine which amount of cylinders to fire and sequence, tone ring on flywheel determines TDC and RPM to run the sequence to driver.
by John Fenner
Wed Sep 23, 2020 9:24 am
Forum: Airboat Tech
Topic: Got a SS welding question...
Replies: 16
Views: 1088

Re: Got a SS welding question...

C25 works, tri mix gives a blonde weld and cleaner appearance.
by John Fenner
Wed Sep 23, 2020 9:22 am
Forum: Airboat Tech
Topic: thrust line angle
Replies: 2
Views: 325

Re: thrust line angle

Plumb to center of hull, and prop shaft plumb to leveled hull fore and aft.
by John Fenner
Sun Aug 23, 2020 5:59 am
Forum: Aircraft Power Only
Topic: 05 40 oil cooler
Replies: 1
Views: 305

Re: 05 40 oil cooler

-8 fittings or at least 1/2"NPT to adapt to.
by John Fenner
Tue Aug 18, 2020 9:07 am
Forum: Automotive Power Only
Topic: Is this from detonation?
Replies: 19
Views: 2159

Re: Is this from detonation?

As per the pm, the mellings number superceded, this will work, or find a exact replacement for the 1978 chevy 267 V8 https://www.ebay.com/p/2154369144?iid=253073614920&chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=253073614920&targetid=935431404853&device=m&mktype=pla&googleloc=90...
by John Fenner
Mon Aug 17, 2020 1:42 pm
Forum: Aircraft Power Only
Topic: Lycoming valve issues
Replies: 3
Views: 461

Re: Lycoming valve issues

Here you go.
by John Fenner
Mon Aug 17, 2020 1:19 pm
Forum: Aircraft Power Only
Topic: Lycoming valve issues
Replies: 3
Views: 461

Re: Lycoming valve issues

Valve seat is not ground correctly, the seating area is too far out to the outer edge of the valve face, the seating area should be central to the valve face, I will try to find a picture to illustrate it for you, the edge of the valve on the seat, with likely bad contact full circle of seat caused ...
by John Fenner
Mon Aug 17, 2020 1:13 pm
Forum: Airboat Talk
Topic: 220 gpu fuel issues
Replies: 7
Views: 572

Re: 220 gpu fuel issues

If it has the zenith carb on it still I would suggest a Holley 500, and a modified intake to mount it on, where are you located? I can fab up a manifold for you.
by John Fenner
Fri Aug 07, 2020 9:27 am
Forum: Aircraft Power Only
Topic: Hull Size for 0540
Replies: 12
Views: 4776

Re: Hull Size for 0540

I reference the bottom for size, it does not run on the top, you can measure a manufacturer's hull at the bottom that they claim to be 8' x whatever length, and the bottom measures 6'8"wide.
by John Fenner
Fri Jul 31, 2020 11:13 am
Forum: Site Related
Topic: SA Downtime
Replies: 10
Views: 1693

Re: SA Downtime

Glad you got it squared away, the withdrawal was terrible, haha!
by John Fenner
Fri Jul 24, 2020 10:54 am
Forum: Airboat Tech
Topic: hull design and building materials
Replies: 3
Views: 804

Re: hull design and building materials

If you have access to a press brake with v block lower and round upper dies that is 14' long I can walk you through a design that will perform flawlessly.
by John Fenner
Sun Jul 19, 2020 6:01 am
Forum: Aircraft Power Only
Topic: What are these bolts?
Replies: 9
Views: 1249

Re: What are these bolts?

Use the bellhousing flange bolt hole, cut the unused tab off the starter bracket to use the other bellhousing hole, bolt a piece of angle to that and build from there.
by John Fenner
Wed Jul 15, 2020 8:47 am
Forum: Automotive Power Only
Topic: Is this from detonation?
Replies: 19
Views: 2159

Re: Is this from detonation?

Yes, and a very lean condition.
by John Fenner
Wed Jul 15, 2020 8:45 am
Forum: Aircraft Power Only
Topic: Mechanical Fuel pump questions 220 GPU
Replies: 23
Views: 1596

Re: Mechanical Fuel pump questions 220 GPU

You will likely never need to replace it again, keep in mind, these engines sat for years after being pulled from service, the diaphragms had residual fuel in them on last run, so they dried out like any other fuel system component. The original hoses on most were petrified when we tore the packette...
by John Fenner
Tue Jul 14, 2020 4:40 pm
Forum: Automotive Power Only
Topic: DD 350 RV cam selection
Replies: 1
Views: 520

Re: DD 350 RV cam selection

viewtopic.php?f=48&t=43724&start=25

Edit post, 390 cfm Holley modified.
by John Fenner
Tue Jul 14, 2020 8:55 am
Forum: Aircraft Power Only
Topic: Mechanical Fuel pump questions 220 GPU
Replies: 23
Views: 1596

Re: Mechanical Fuel pump questions 220 GPU

You have to use the base from the GPU pump, the spring is the pressure regulating factor.
by John Fenner
Mon Jul 13, 2020 9:02 am
Forum: Aircraft Power Only
Topic: Mechanical Fuel pump questions 220 GPU
Replies: 23
Views: 1596

Re: Mechanical Fuel pump questions 220 GPU

225 slant 6, or look up 50s corvette fuel pump rebuild kit, you have to find the one with the 6 check valves.
by John Fenner
Sun Jul 12, 2020 6:16 am
Forum: Aircraft Power Only
Topic: Warp drive question
Replies: 7
Views: 960

Re: Warp drive question

Not to sound like a smart alec, but it sounds as if you have 7/16 bolts with 5/8 hex heads, that said the torque will be 50-55 ft-lb, now the question is, does the prop hub have 1/2 holes or 7/16 holes, if 7/16 great, if 1/2 you need to get tubing to Bush the bolt to bore size, along with the drivers.

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