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OM 606 head porting
zeeman Offline
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#1
OM 606 head porting
Has anyone done any head porting on the OM 606 engine? Is there any benefits of doing any porting work?
01-13-2019, 12:03 PM
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firen456 Offline
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#2
RE: OM 606 head porting
Yes. Exhaust side is a very small restriction. Intake is almost perfect. I also fitted bigger valves and machined the seats to fit the bigger valves. Torue ove the whole rpm-band increased signifincantly.
01-13-2019, 12:38 PM
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zeeman Offline
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#3
RE: OM 606 head porting
(01-13-2019, 12:38 PM)firen456 Wrote: Yes. Exhaust side is a very small restriction. Intake is almost perfect. I also fitted bigger valves and machined the seats to fit the bigger valves. Torue ove the whole rpm-band increased signifincantly.

Did you go with bigger valves on the exhaust as well as the intake? What did you use for valves, seats and guides?

Zeeman
01-13-2019, 09:00 PM
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firen456 Offline
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#4
RE: OM 606 head porting
Went both sides with CDI valves. I Used the 7mm cdi valve guides. Seats in the head were cut bigger and seats on the valves were regrinded. The valves are 1,5mm shorter if i remeber it right... Uses Lashcaps to compensate that.
01-14-2019, 01:40 AM
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zeeman Offline
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#5
RE: OM 606 head porting
(01-14-2019, 01:40 AM)firen456 Wrote: Went both sides with CDI valves. I Used the 7mm cdi valve guides. Seats in the head were cut bigger and seats on the valves were regrinded. The valves are 1,5mm shorter if i remeber it right... Uses Lashcaps to compensate that.

So you used the original seats and cut them bigger? And used the inline 6 cylinder CDI valves? Were did you get the lash caps from?

Thanks Zeeman
01-14-2019, 02:14 AM
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firen456 Offline
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#6
RE: OM 606 head porting
exactly... Used 1mm schrick lash caps. 6mm in diameter.
01-14-2019, 07:41 AM
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JoeB Offline
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#7
RE: OM 606 head porting
Did you need to fly-cut pistons for valve clearance? Or is the bottom end standard om606?
01-14-2019, 11:09 AM
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zeeman Offline
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#8
RE: OM 606 head porting
(01-14-2019, 07:41 AM)firen456 Wrote: exactly... Used 1mm schrick lash caps. 6mm in diameter.

I see were F-tune also makes different thickness lifter shims also.

Thanks for all the info.    Zeeman
01-14-2019, 12:03 PM
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firen456 Offline
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#9
RE: OM 606 head porting
Yes, had to mill the gaps in the pistons. But not that much. Only like 0.5-1mm. I did that free hand with a real mans dremel. You have to work very carefully. But it would be better to get the pistons out the engine and do the job on a mill.
01-14-2019, 01:21 PM
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zeeman Offline
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#10
RE: OM 606 head porting
(01-14-2019, 07:41 AM)firen456 Wrote: exactly... Used 1mm schrick lash caps. 6mm in diameter.

How thin do the seats get? It looks like the intake seat is already thin, the exhaust not so much.
01-14-2019, 10:33 PM
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zeeman Offline
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#11
RE: OM 606 head porting
(01-13-2019, 12:38 PM)firen456 Wrote: Yes. Exhaust side is a very small restriction. Intake is almost perfect. I also fitted bigger valves and machined the seats to fit the bigger valves. Torue ove the whole rpm-band increased signifincantly.

What RPM do you feel the torque improved the most? Just wondering if a offroad vehicle would benefit that much vs a street machine.
01-14-2019, 10:36 PM
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firen456 Offline
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#12
RE: OM 606 head porting
I don't have a dyno graph before/after. You have to try this by your own.
01-15-2019, 06:44 AM
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