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by John Fenner
Thu Jan 07, 2021 1:42 pm
Forum: Aircraft Power Only
Topic: Need help with pe90 470 conversion
Replies: 9
Views: 702

Re: Need help with pe90 470 conversion

Bit on the lean side, not sure what Demons come with out of the box, 31 squirter is fine, order gaskets for the bowl and metering plate, order a power valve plug, order a pair each of # 74-75-76 jets. Ok, that said be very sure that the accelerator arm has zero lash to the pump and cam and it squirt...
by John Fenner
Tue Jan 05, 2021 2:01 pm
Forum: Aircraft Power Only
Topic: Need help with pe90 470 conversion
Replies: 9
Views: 702

Re: Need help with pe90 470 conversion

First off, is the accelerator pump adjusted correctly, is there fuel coming out of squirters, have there been any plug color checks to see what the mixture is? What pistons are in it, (compression ratio) ignition timing?
by John Fenner
Sun Dec 20, 2020 5:40 am
Forum: Prop Talk
Topic: NGQ or .....
Replies: 8
Views: 566

Re: NGQ or .....

I put a 74" NGQ on Barefoot Betty, "Betty Osceola's" AV 540, Fenner hull #1, pushes great and quiet, I put a 74" Whirlwind Whispertip on Zilla, #4 Fenner hull with a 10:1-220/520 AV much more impressed with it's performance vs the Q.
by John Fenner
Thu Dec 17, 2020 9:04 am
Forum: Airboat Talk
Topic: Lets talk about harmonics
Replies: 20
Views: 1410

Re: Lets talk about harmonics

Well, I can say that I have witnessed what harmonics can do, 3 blade sensenich on an O-540 cracked the crankshaft lengthwise through the sealing area of the shaft, through to the slinger and thrust flange, continental O-520, 3 blade again, sheared off every timing gear bolt, neither of the engines h...
by John Fenner
Tue Dec 15, 2020 11:04 am
Forum: Aircraft Power Only
Topic: Airtec starter
Replies: 4
Views: 389

Re: Airtec starter

The airtec starter doesn't require a separate solenoid, run start button direct to the starter activation lead.
by John Fenner
Tue Dec 15, 2020 10:56 am
Forum: Aircraft Power Only
Topic: 470 angle valve continental
Replies: 2
Views: 411

Re: 470 angle valve continental

You have to take in consideration of clearances, bearings, ring lands, wrist pin to rod and pin bore in piston, now the other thing to consider is, your camshaft is preloaded by valve springs, which will allow it to rotate easy one way, feeling the lash in the gears is likely what it is.
by John Fenner
Tue Dec 01, 2020 9:16 am
Forum: Prop Talk
Topic: 63 inch warp drive on 350dd
Replies: 2
Views: 347

Re: 63 inch warp drive on 350dd

That is too short, but if you can get it for the right price, locate a set of longer blades to put in the hub.
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: 416

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: 470

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: 919

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: 470

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: 1183

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: 1183

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: 1361

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: 468

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: 408

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: 2454

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: 589

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: 589

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: 639

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: 5040

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: 2018

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: 949

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: 1350

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: 2454

Re: Is this from detonation?

Yes, and a very lean condition.

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