Topic: P35 and P40 manifolds – Antique Outboard Motor Club,Inc

This topic has 11 replies, 5 voices, and was last updated 5 years, 7 months ago by lyks2tinkr.

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September 11, 2018 at 4:57 pm #11171
lyks2tinkr
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US Member - 2 Years
Can someone please supply some pictures or at least some description of the correct exhaust manifolds for each motor?
My P40 has the manifolds that have side ribs.
My P35 has manifolds that are smooth.
I have a spare set of large manifolds but they just look like large versions of an A35 and I think they are for a P30.

I just received some pictures of another members nice looking P35 and it has the ribbed manifolds.
September 11, 2018 at 5:42 pm #82659
RICHARD A. WHITE
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Lifetime Member
I have a P30 as well as a P40…I will try to get photos this evening…

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 11, 2018 at 8:34 pm #82670
stanley
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US Member - 2 Years
The parts list I have shows smooth for P35 has different part number for P40.I assume they are ridged.My P35 came with one of each.To further complicate matters check the pictures from Antique Outboarder archives.

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September 11, 2018 at 9:09 pm #82675
RICHARD A. WHITE
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Lifetime Member
I have this as my P40 exhaust:

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 11, 2018 at 9:43 pm #82679
adam1961
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Canada Member - 2 Years
Both the P35 nd P40 had ribbed manifolds. The in late 1928 or 29 they came up with the accessory muffler for the P35 and P40 which was the "box" shapped part riveted to the round tube. This was also the mounting point for the accessory underwater exhaust.

The P30 has smooth manifolds and I know with certainty that they are one year only parts.

Hope that helps
September 11, 2018 at 9:57 pm #82680
RICHARD A. WHITE
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Lifetime Member
Just to muddy the water…here is my P30…side view

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 11, 2018 at 9:58 pm #82681
RICHARD A. WHITE
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Lifetime Member
They were loaded off my phone that is why they are sideways…

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 12, 2018 at 11:08 am #82701
adam1961
Participant
Canada Member - 2 Years
quote Richard A. White:

Just to muddy the water…here is my P30…side view

Richard,
I should have been more specific in my post. The runner portion is smooth on the P30 as pictured. The P35 and P40 have ribs all the way along the runner. All of the larger motors had some type of ribbed reinforcemnt in the flance area. I have seen quite a few A series manifolds that are distorted where the cylinder type wrap mounts. I would assume that this was caused by heat, but not sure.
September 12, 2018 at 12:41 pm #82706
RICHARD A. WHITE
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Lifetime Member
Ahh I see what you did there…lol

http://www.richardsoutboardtools.com
classicomctools@gmail.com
September 12, 2018 at 12:47 pm #82707
george-emmanuel
Participant
US Member
The P-40 did not come standard with compression release,—it was an option. In the Johnsons Accessories catalog you will see a listing for accessory cylinders for A-35, K-40, KR-40, P-40 and PR-40. Underwater exhaust was also available as an option for those motors as well as the KL and PL long shaft versions.

George
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