New engine

[karl h]

i saw a pair on mexxs workbench

[Elnef]

Yes my set has no 1 but there is more sets out there Paul Bate for examble

[karl h]

those on mexx workbenche are for paul

[Elnef]

Some testing

[bedjo78]

Hi Elnef.

would you share the valve size with those awsome heads

[mikko k]

.

[Elnef]

Hi Elnef.

would you share the valve size with those awsome heads

54 40

[bedjo78]

That is very good  spread valve guide. I have old JPM but max only 48 38 and the valve almost touching each other

[mikko k]

Evo350 has 54/40 valves and 4” bore. All other jpm heads have 48/38. But you can fit about 50/40 in those.

[bedjo78]

Evo350 has 54/40 valves and 4” bore. All other jpm heads have 48/38. But you can fit about 50/40 in those.

yes may be 50/48 doable. but I think, Is it worth to change Ti valve for 2 mm bigger?

anyway Elnef engine look very promising

[mikko k]

Evo350 has 54/40 valves and 4” bore. All other jpm heads have 48/38. But you can fit about 50/40 in those.

yes may be 50/48 doable. but I think, Is it worth to change Ti valve for 2 mm bigger?

anyway Elnef engine look very promising

48/38mm valves at jpm230/250 heads are manley ss, meaning stainless steel and retainers are titanium when new. What anything is worth at racing, you have to deside that yourself. Sometime 2mm is needed.. I had… 304hp/320Nm from 230 heads at NA engine…

[bedjo78]

Yes Miko. original valve on MS230 are SS. I changed to Ti from CB perf complete with psi spring and Checy Ti retainers

[ibg]

Mikko, what cam/compression/engine size did you use to get 304hp/320Nm out of those heads?
many thanks in advance.

[mikko k]

Yes Miko. original valve on MS230 are SS. I changed to Ti from CB perf complete with psi spring and Checy Ti retainers

Ok.

[mikko k]

Mikko, what cam/compression/engine size did you use to get 304hp/320Nm out of those heads?
many thanks in advance.

4”x88mm (2850cc), 14:1 comp ratio, special camshaft, originally jpm but modified later, 50/40 valves,17mm lift at valve, heads modified; welded, reshaped, etc. Efi, ms109 fuel, Jenvey 60mm throttle bodys, 3-step stainless steel exhaust that I made myself. So, nothing special. Unfortunately, driver isn’t good (me), gearing not the best possible and car were a little pit heavy, so best et were 10,7s/202,5kmh. Today engine is base for turbo engine.

Sorry Elnef messing your thread.

[Elnef]

Sorry Elnef messing your thread.

No problem

 Yes there is more room between valve guide on evo350 you need that with this size valves

You will also need a new rocker shaft the stud outside left and right is locatet different and new valvecovers because the head is a little bigger

[bedjo78]

Mikko, what cam/compression/engine size did you use to get 304hp/320Nm out of those heads?
many thanks in advance.

4”x88mm (2850cc), 14:1 comp ratio, special camshaft, originally jpm but modified later, 50/40 valves,17mm lift at valve, heads modified; welded, reshaped, etc. Efi, ms109 fuel, Jenvey 60mm throttle bodys, 3-step stainless steel exhaust that I made myself. So, nothing special. Unfortunately, driver isn’t good (me), gearing not the best possible and car were a little pit heavy, so best et were 10,7s/202,5kmh. Today engine is base for turbo engine.

Sorry Elnef messing your thread.

very cool engine.

Sorry Elnef