WOT old V4

Droll · Sep 3, 2004

How high can I run this engine

WOT now = 5000 rpm ( if tach is correct ) Prop = 10 x 12 Speed = 40 miles ( max speed of the hull ?? ) Boat = Selco Selfleet ( Norweagan 1962 mod )

More pics ,see web page . According to the manual WOT = 4500 ( Seloc ) According to the sales brocyre WOT = 4000 - 5000 Service manual (Johnson oem) = ?? only 90hp at 4500 rpm ( WOT ?? ) What engine ? ,see below .

walleyehed · Sep 3, 2004

Re: WOT old V4

Joe Reeves Knows this vintage better than most, maybe he will give some insight....????? I DO know, that you need a fuel tanker to keep that thing running for very long, as they were very hard on the fuel milage. I would error torwards the OEM manual, but possibly consider 4500-5000 as the range your not going to hurt anything. Don't take this as "word" because I personally don't know the range, but 5000 shouldn't hurt anything with good fuel, oil, etc.

Paul Moir · Sep 3, 2004

Re: WOT old V4

Have a look at the specifications in the OEM manual again. For example, on my '63 28hp: Seloc - WOT = 4500 Sales brochure = 4000 - 5000 RPM Range Manual - OEM = '*Horsepower (O.B.C certified) 28hp at 4500 RPM' Manual - OEM (also) = 'Full throttle operating range 4000 to 5000 RPM' Nameplate on engine = 'Operating Range 4000 to 5000 R.P.M. 28H.P. at 4500 R.P.M. Certified by O.B.C.' I take this all to mean that you want your WOT RPMS to be between 4000 and 5000, and that the engine will make it's rated power at 4500. So propping for the top of the range on your lightest load would make sense. Hope this helps!

walleyehed · Sep 3, 2004

Re: WOT old V4

Makes sense to me..

Droll · Sep 4, 2004

Re: WOT old V4

Sounds good . Lets hope nothing changes then

, engine not fine tuned yet , will try tilting the engine one hole up . If rmp rices , can I get any bigger prop for this engine ??( biggest Mitchigan = 10 x 12 ).

ledgefinder · Sep 4, 2004

Re: WOT old V4

Nice job...

jimmbo · Sep 4, 2004

Re: WOT old V4

If you can get that 90 to spin a 12" prop to 5000 rpm you are doing very well. Both my dad and my uncle had the same motor and both had to put 9 1/4" props to get 4900. Slightly bigger boats though.

Droll · Sep 4, 2004

Re: WOT old V4

Nice job...

Thanks , it only takes time and time

and money

you know .

If you can get that 90 to spin a 12" prop to 5000 rpm you are doing very well

Then help me with this : Tach = 73288 TELEFLEX From ad The Tachometer in this set is for Outboards & 4-Cycle Gas 0-6000 rpm On Engine Coil or O/B Alternator Connected to coil Adjusted to 4 pulser pr round ( same as a 4-cycle V8 ) My V4 = 4 sparks pr round = any 4-cycle V8 = 4 sparks pr round . Correct ?? in my mind it is

A boat is a hole in the water that you continously pour money into

jimmbo · Sep 5, 2004

Re: WOT old V4

yup. A 4 clyinder 2 stroke has as many power strokes per revolution as a 8 clyinder 4 stroke. The 4 sparks per rev on todays 8 cylinder car engines is not always true anymore. A lot of cars have ignition systems that spark every revolution

Droll · Sep 5, 2004

Re: WOT old V4

A lot of cars have ignition systems that spark every revolution

?? Not any 4-stroke ( Otto engines ), have heard of dual sparkplugs ( 2 sparks every secound round (parrallell wired )) Intake ( Piston down , sucking air/fuel mix in ) Compresson ( piston up > spark at top (or just before tdc )) Working ( piston pushed down ) Exhost ( Piston up , pushing exhast out ) Know they did plan to make a 2-stoke engine with a commpressor feed ,bypasing the crankshaft housing ( right to the intakeports ), and the use the same pressurased oli lubrication system as an 4-stoke engine . This engine would have 1 spark pr cylinder pr round ( 2-stroke(working)/ 4-stoke(lubrication )hybrid ) .

jimmbo · Sep 5, 2004

Re: WOT old V4

These engines are conventional 4 strokes but don't have a distributor, each cylinder has its own coil and is fired by triggers on the crankshaft, hense why it fires every revolution. Buick 3800 is one example.

G DANE · Sep 5, 2004

Re: WOT old V4

You did a great job an both boat and motor. Was there never a windshield on the boat ? Its very beautifull and your glassfiber work looks brilliant. I am working on a dash myself. Did you use putty on top af glassfiber or just lay layers and sand untill the shape was that perfect ?. I am a little scared to use putty as I am afraid it would crack later on.

Droll · Sep 6, 2004

Re: WOT old V4

G DANE

Was there never a windshield on the boat ?

It was delivered with a windshield like this one . Do plan to make a new windsheld ( see picture above ),just missing the glass ( or akryl , lexan ?? )

....just lay layers and sand untill the shape was that perfect

Did lay 2-3 layer of glas ( alltogether at once ) then shaped it by sanding ( 40 grid ),then some topcoat > wet sanding > Jotun Penguin AntiPest (primer )> wet sanding > Jotun Penguin HardTop (polyurethane high gloss coating ) . Jotun homepage ( Norway Jotun homepage jimmbo

These engines are conventional 4 strokes but ...

Not convinced

.

don't have a distributor

No problem

each cylinder has its own coil

No problem

fired by triggers on the crankshaft

No problem , electronic/computer controled

hense why it fires every revolution

Problem , how 4-stroke engines work see web page

.

Paul Moir · Sep 6, 2004

Re: WOT old V4

I belive jimmbo is talking about 'wasted spark' ignition systems where there's also a spark at the top of the exhaust stroke. It doesn't do anything since the combustion chamber is full of burnt exhaust at the time, hence the term 'wasted'. It simplifies the ignition system (sometimes) since there's no need for a camshaft (ie 1/2 engine speed) pickup to tell the computer when it's on a compression stroke instead of an exhaust stroke. Web page about windsheilds if you have not yet seen it. Click here.

jimmbo · Sep 6, 2004

Re: WOT old V4

Originally posted by Paul Moir: [QB] I belive jimmbo is talking about 'wasted spark' ignition Thanks Paul. I wasn't sure what it was called.

Droll · Sep 6, 2004

Re: WOT old V4

OK jimmbo got it

. This system makes it easier to design electronic ingnition systems ( quick Google gave this > Wasted spark firing eliminates the distributor and its associated mechanical faults ) . Never eliminated the distributor , but got ridd of the points ,see Pointless ignition , did work perfect BUT I never got the exsakt timing ( no data in the manual ( degres before tdc ))

jimmbo · Sep 6, 2004

Re: WOT old V4

That 90 wasn't designed to be timed with a light. it was timed by careful gapping of the pionts and making sure the distributor was in sync with the flywheel via marks on the flywheel to mark on the block and marks on the distributor pulley with mark on distr bracket.

Droll · Sep 7, 2004

Re: WOT old V4

That 90 wasn't designed ..

I know , got it running , tuned by ear

. But after the rebuild it´s back to basic ( points ) ,tuned by manual

.

WOT old V4

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