337's for 65 case alteration to 85 jugs

[baldy]

Howdy, I am an A&P/IA and I have 3 337's aprovved to modify 65 cases to 85 cylinders 2 are for taylorcrafts and were aproved by the Scottsdale FSDO and 1 is for a Luscombe and was approved at the Dallas fort worth FSDO, it is an easy modification with no weight change and uses the same crankshaft cam and lifters, if anyone is interested they are FREE just need postage. you can contact me at [email protected] adios for now from baldy/pilotsharetheride

[SteveR]

Re: 337's for 65 case alteration to 85 jugs

Does that give you the same HP and cubic inches as a C-85?

[woodmw]

Re: 337's for 65 case alteration to 85 jugs

Would you consider posting them on the website? In the tech section?

[Nefj40]

Re: 337's for 65 case alteration to 85 jugs

Luscombe link

http://www.bowersflybaby.com/tech/A.65%20to%20C.85%20cylinders.pdf

[d.grimm]

Re: 337's for 65 case alteration to 85 jugs

I’ve had experience with a C-85 breaking the case studs, will this make
the A-65 case more prone to this?

[Ragwing nut]

Re: 337's for 65 case alteration to 85 jugs

Does that give you the same HP and cubic inches as a C-85?

Same displacement, but not same HP, techinally closer to 75 hp with 65 carb and intake which is what a C75-12 is that was used on some Luscombe's.

[Leenicklas]

Re: 337's for 65 case alteration to 85 jugs

I would like to know if you have or know of a 337 approving milennium cylinders on a 75 case?

[3Dreaming]

Re: 337's for 65 case alteration to 85 jugs

Same displacement, but not same HP, techinally closer to 75 hp with 65 carb and intake which is what a C75-12 is that was used on some Luscombe's.

Since the stroke stays the same, but you increase the bore it has to have more displacement. It should be 190 cubic inch instead of 170.

[Ragwing nut]

Re: 337's for 65 case alteration to 85 jugs

Since the stroke stays the same, but you increase the bore it has to have more displacement. It should be 190 cubic inch instead of 170.

same displacement as 85 was what I meant referring to Steve R post.

[Edwin Otha]

Re: 337's for 65 case alteration to 85 jugs

Did this modification to an A65 case about 10 years ago. Works fine. The 65 case is a little stronger than the 85 and a bit heavier. You get 190CI but at 2300 still makes about 65HP.
EO

[Kerbs]

Re: 337's for 65 case alteration to 85 jugs

Did this modification to an A65 case about 10 years ago. Works fine. The 65 case is a little stronger than the 85 and a bit heavier. You get 190CI but at 2300 still makes about 65HP.
EO

So no real increase to HP achieved then?

[Ragwing nut]

Re: 337's for 65 case alteration to 85 jugs

So no real increase to HP achieved then?

no but it resolves the issue of finding good a65 cylinders which is getting harder to find

[Edwin Otha]

Re: 337's for 65 case alteration to 85 jugs

Mike is spot on for the cylinders. You have to do a lot of looking for good cylinders, they are out there but you have to hunt now days.

No real HP advantage IF you run the 65 by the book. Once a 65 always a 65, but you can now find new cylinders for it.

Should the engine be subject to an over speed condition you would realize the added horsepower, but the operator would reduce the throttle to be with in the 65 operating range and rated horsepower.
EO

[PA1195]

Re: 337's for 65 case alteration to 85 jugs

Does the added displacement require more fuel than the stock carb metering is designed for?

Gary

[Edwin Otha]

Re: 337's for 65 case alteration to 85 jugs

Didn't notice any differences from the 65 at 2300RPM.
EO