REFLECTOR: Franklin Will not turnover when hot

Wed Jun 1 20:35:37 CDT 2011

Rene,

You have good points.  I have a scoop that is similar to Larry's (as
best I can tell from the picture).  I was concerned about the effect on
downdraft cooling as well, so I cut an opening in the lower cowl just
behind the oil pan to let the air out.  I believe others have done this
also.

John

Rene Dugas wrote:

> Larry,
>
> I may not be understanding this note but if you extended the scoop is
> there just more space or are you blowing air from the scoop over the
> pan and accessory case.  This cooling air is coming from where?
>
> If it opens under the engine, I do not see how you obtain the cowl
> vacuum we all want for downdraft cooling.  I must be missing
> something.  Help?  I like the scoop.  Mine is whimpy in comparison so
> please be gentle but I get 1? of increased manifold pressure.  What do
> you do with all that air?
>
> Rene?
>
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> On Behalf Of Laurence Coen
>
> Sent: Friday, May 27, 2011 1:13 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Franklin Will not turnover when hot
> Mike ? WJ,
> My brother made two starter nose pieces, the first of which is shown
> in the photos.  The recess where the mounting bolts go are machined on
> the wrong side.  Number two is in use.  I think that your hot start
> problems are related to heat soaking the starter motor and the reason
> for the third picture.  My belly scoop is extended down 1? to increase
> air flow over the oil sump and the accessory case.  I wasn't so
> concerned about the starter but the alternator getting too hot.  I
> have #2 wire and never a hot start problem.  A plenum mounted blast
> tube for the starter might be the solution.
> Mike.  You may be able to use my ?spare? nose piece if you trim off
> the mounting ears and add an ?L? shaped bracket to clamp the starter
> in place.  If you want it email me off reflector with your address and
> I'll send it to you.
> Larry Coen
> N136LC
> P.S.: My brother is retired and no longer has access to a machine
> shop.
> From: Michael Watson
> Sent: Sunday, May 22, 2011 5:13 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Franklin Will not turnover when hot
> Larry,
>
> Mine came with the same starter and adapter plate. I replaced the
> original starter with a skytex and then a ford (NAPA 2446115),
> but still the same problem. I have never had a problem with adapter
> plate, but you are right, it is poorly made and is
> prone to leak oil back into the starter solenoid. Would your brother
> consider making one for me? PM me if he can.
>
> On Sun, May 22, 2011 at 3:13 PM, Laurence Coen ?lwcoen at hotmail.com?
> wrote:
> Mike,
> My Franklin came with a Honda Civic starter with a very poorly made,
> welded-up adapter plate.  Luckily my brother was a tool and die maker
> and produced an adapter of my design from an aluminum billet.  The
> battery is a 55 AHR Optima deep discharge with #2 wire.  Never a
> starting problem.
> Larry Coen
> N136LC
> From: Michael Watson
> Sent: Wednesday, May 18, 2011 3:38 PM
> To: Reflector
> Subject: REFLECTOR: Franklin Will not turnover when hot
> To all Franklin powered Velocity owners.
>
> From new, I have always had a problem starting the engine within ten
> to thirty minutes after landing.
> The engine will turn to it's first compression stroke then stop. After
> three or four try's I'll just have to
> wait thirty minutes, then the engine will turnover and start within
> one or two power stroke/s.
> This is annoying if you just want to make a quick fuel stop.
>
> I have replaced the Concord 35x with an Odyssey PC1200MJT 40AH battery
> 1200 Amp. starting current
> with the same result.  I have placed another Odyssey 960 battery
> behind the rear left seat, and wired it
> so it parallels the front battery when the starter is engaged, still
> same problem. A year or so ago, some
> one on the reflector suggested replacing the starter with a ford part
> number. I did that, still same problem.
>
> The plane was originally wired with #2 wire, all connectors were power
> crimped, the connectors to and
> from the contractors are cleaned, treated and re tightened at each
> annual. I realize that the Franklin has
> 10.5:1 compression and when hot, can actually be slightly more, but my
> BMW M5 engine is also 10.5:1
> compression and the same battery spins the engine very fast hot or
> cold. Could the problem be that the
> starter is being heat soaked, which reduces it's efficiency?  Is
> anyone else experiencing this problem?
>
> BTW:  I tried a Skytek starter which broke on the first start. it went
> into the garbage.
> --
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS HX Synthetic Vision
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> --
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS HX Synthetic Vision
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