Changing sumps = Lycoming to Superior

[OkieDave]

Originally Posted by mahlon_r

Back in the day, we got a pretty consistent 7 hp increase over a stock vertical sump when using the superior, aero or Lycoming forward facing sump. when we first tried those sumps, we tested the same engines, with either sump on the same day, in the exact same conditions in the test cell, ie with same ambient's and same oil temps and chts and got 7 to 7.5 hp on all of the tests. Purpose of the test was to confirm a HP increase that we were comfortable to pass along to perspective customers. We always advertised a 7hp increase with the cold air sumps.
Good Luck,
Mahlon

How would you account for ram effect in a dyno without a prop or forward motion? Or, in the alternative, is it negligible in the real world?

[climberrn]

Originally Posted by SJordan

Just a quick note.
Just pulled the crazy long servo studs out of two new Superior sumps. They will not come out unless you heat them up nice and hot. I used MAP gas torch and with dual nuts they will pop lose with enough heat. No discoloration was caused.

Are you talking about the 4 forward studs that hold the servo on?

Called Superior about them since they were too long. Was told there is a spacer that is supposed to be installed that does not come with the sump. The spacer was cheap, and the studs were perfect length when the proper spacer is on. Don't know why the sump does not come with that.

[mahlon_r]

Originally Posted by OkieDave

How would you account for ram effect in a dyno without a prop or forward motion? Or, in the alternative, is it negligible in the real world?

There was no ram effect. The increase in power was from better intake design with cooler air than the vertical sump offered. the 7 hp increase was static power increase.
I would think that the ram air effect would be almost the same with the forward facing sump as the vertical sump with an air box as long as the airspeeds were similar. Maybe not? But I would think that with the airspeed constant the air pressure build up in the vertical sump airbox would be the same as the airbox arrangement with the horizontal sump. Knowing that the horizontal sump does produce more power that it would follow that the airspeed would be higher for a given power setting and then the airbox ram pressure would be greater due to the increased airspeed and thus you would see more power over what the horizontal sump offered without ram effect. don't know.... but that is what I would assume.
Good Luck,
Mahlon

[hohocc]

Originally Posted by mahlon_r

Back in the day, we got a pretty consistent 7 hp increase over a stock vertical sump when using the superior, aero or Lycoming forward facing sump. when we first tried those sumps, we tested the same engines, with either sump on the same day, in the exact same conditions in the test cell, ie with same ambient's and same oil temps and chts and got 7 to 7.5 hp on all of the tests. Purpose of the test was to confirm a HP increase that we were comfortable to pass along to perspective customers. We always advertised a 7hp increase with the cold air sumps.
Good Luck,
Mahlon

Mahlon,
Just to confirm, was this 7hp difference on a 320, 360, or 540? I'm assuming a 320 as the OP refers to that but just wanted to check. Presumably the figure would vary somewhat with displacement and therefore air volume consumed.
Thanks.

[maniago]

Originally Posted by climberrn

Are you talking about the 4 forward studs that hold the servo on?

Called Superior about them since they were too long. Was told there is a spacer that is supposed to be installed that does not come with the sump. The spacer was cheap, and the studs were perfect length when the proper spacer is on. Don't know why the sump does not come with that.

Well now thats interesting. Did you get that spacer from Superior direct or is it just a generic from....?

[mahlon_r]

Originally Posted by hohocc

Mahlon,
Just to confirm, was this 7hp difference on a 320, 360, or 540? I'm assuming a 320 as the OP refers to that but just wanted to check. Presumably the figure would vary somewhat with displacement and therefore air volume consumed.
Thanks.

It was 7 hp on 320's and 360's. The 540 didn't use that style sump....there are cold air sumps available for the 540 but whenever we used them they were also other mods to the engines so I don't have a increase number for the sump alone.
Good Luck,
Mahlon

[climberrn]

Originally Posted by maniago

Well now thats interesting. Did you get that spacer from Superior direct or is it just a generic from....?

Got the spacer from Superior. Less than $10 bucks if I remember right. Twice that with shipping. No idea why hey don't include it with the $1500+ sump!!!

[cdeerinck]

A little bird told me that Lycoming is introducing a cold air sump soon. Should be one on my new motor.