Doyne conversion

How to keep the Cessna 170 flying and airworthy.

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shanmoon
Posts: 2
Joined: Tue Aug 09, 2022 3:04 pm

Re: Doyne conversion

Post by shanmoon »

Yep I typically saw around 27MP 2700 RPM. The control in the cockpit is fully advanced. So sounds like it could be that the timing was change slightly at the shop vs the oddball prop arm beingstalled improperly? Are you aware of any STC paperowk that states this is how the timing is set?

Thanks for the response!
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c170b53
Posts: 2527
Joined: Mon Apr 22, 2002 8:01 pm

Re: Doyne conversion

Post by c170b53 »

You might Pm Bruce Fenstermacher to sort out your membership status.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
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GAHorn
Posts: 20968
Joined: Fri Apr 12, 2002 8:45 pm

Re: Doyne conversion

Post by GAHorn »

What do you mean by “timing”..? Timing usually refers to ignition timing such as the magneto advance, which is set by the engine mfr’r.
If your max RPM is not being achieved…that is probably a governor or prop-control rigging adjustment.
The fact that you might have a unique gov-control-arm which your mechanic “has never seen before” doesn’t mean much. The Doyn STC is a custom installation and may very well utilize a special part. Can you post a pic of the control arm..?? and do you have a part number or reference number for your prop gov and prop control cable..?

Here’s two pics found online of the B-2 gov with control arms. Does yours look anything like these?
B8F78769-D897-48B2-B3F2-939581BA8F4B.png
5F4F506C-158C-4ABA-85FB-E084444EA600.png
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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cfzxo
Posts: 137
Joined: Sat Oct 19, 2002 3:29 pm

Re: Doyne conversion

Post by cfzxo »

Shanmoon, I have sent you a pm please email me . I have had this situation with the governor before
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