SEH-57 Cam in my Evo
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Cruiser
Joined: Nov 2019
Posts: 109
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From: Norway
SEH-57 Cam in my Evo
Hi,
I pulled my top end apart the other day. And to my delight i found a set of domed KB pistons:-)
The pistons are stamped with 266 and KB.
The heads are stock, but the valvesprings are upgraded too much beefier ones.
The cam is a SEH-57 cam, witch after som research I understand its a Screaming Eagle cam... Havent understood the reason for the H though, since all I can find is SE-57 but...
Is this a good cam for the setup of pistons I have?
Im planing on putting on some ported heads with altered combustion chamber.
I was told that the bike had a 1450 high comp kit when i bought it.
It pulls much stronger then a stock EVO for sure, but not sure if its built for high RPM or what with that cam. The bike will be dyno´ed as soon as the engine is back together.
Any thoughts on what to expect and if I should alter som more things to make the bike a little bit more fun:-)
I pulled my top end apart the other day. And to my delight i found a set of domed KB pistons:-)
The pistons are stamped with 266 and KB.
The heads are stock, but the valvesprings are upgraded too much beefier ones.
The cam is a SEH-57 cam, witch after som research I understand its a Screaming Eagle cam... Havent understood the reason for the H though, since all I can find is SE-57 but...
Is this a good cam for the setup of pistons I have?
Im planing on putting on some ported heads with altered combustion chamber.
I was told that the bike had a 1450 high comp kit when i bought it.
It pulls much stronger then a stock EVO for sure, but not sure if its built for high RPM or what with that cam. The bike will be dyno´ed as soon as the engine is back together.
Any thoughts on what to expect and if I should alter som more things to make the bike a little bit more fun:-)
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,062
Likes: 7,591
From: Poolville
That cam is a top end cam.. with a 50* ivc it would require 10.5-11.0 Static compression.. Without a good set of heads your leaving a good amount of power on the table..
I think you need to start with measuring the bore and stroke so we can make a more accurate assumption.....
I think you need to start with measuring the bore and stroke so we can make a more accurate assumption.....
Last edited by 98hotrodfatboy; Dec 17, 2020 at 07:54 AM.
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,751
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From: OH
[QUOTE=98hotrodfatboy;19605370
I think you need to start with measuring the bore and stroke so we can make a more accurate assumption.....[/QUOTE]
This
1450 is 88 ci
Dont think stock evo cylinders stretch past 85 cubes w/o changing the stroke?
I think you need to start with measuring the bore and stroke so we can make a more accurate assumption.....[/QUOTE]
This
1450 is 88 ci
Dont think stock evo cylinders stretch past 85 cubes w/o changing the stroke?
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,062
Likes: 7,591
From: Poolville
Thread Starter
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Cruiser
Joined: Nov 2019
Posts: 109
Likes: 76
From: Norway
Hi, thanks for the reply.
I have read that the 266 pistons from KB is rated for 10.5:1 compression in a otherwise stock EVO. So with the new heads that have an altered combustion chamber, Im guessing we are close to 10.7-10.8:1
I will take some photos of the new heads tomorrow.
I have read that the 266 pistons from KB is rated for 10.5:1 compression in a otherwise stock EVO. So with the new heads that have an altered combustion chamber, Im guessing we are close to 10.7-10.8:1
I will take some photos of the new heads tomorrow.
Thread Starter
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Cruiser
Joined: Nov 2019
Posts: 109
Likes: 76
From: Norway
I said what I said because the OP obviously doesn't know what's in the motor he just got this bike apparently because he stated to his surprise he's got domed pistons. So based on that he needs to check everything that's all I'm saying.. How can he possibly know how many cubic inch the motor is by looking at the dome of a piston? AND..... There's no way the heads are stock if he's running a .576" lift cam in an Evo motor.. stock heads can handle safely maximum .515-.520.... MAX...
The seller told me 3 years ago that this was a 1450engine with high compression pistons. I also have compression release valves on the heads.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,062
Likes: 7,591
From: Poolville
With stock heads... That is correct.. coil bind definetely and possible valve to valve clearance issues...
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Thread Starter
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Cruiser
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From: Norway
Since i have been running the engine for 3 years now... The only thing my buddy (who is a Harley tech) noticed is that the valve springs are upgraded.
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Seasoned HDF Member
Joined: Oct 2019
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From: OH
because I acknowledge your evo knowledge.
no slight intended nor implied!
