Merlin Heads

mgbloke · Post by **mgbloke** » Sat Feb 04, 2012 9:18 pm

It was right by one end long bolt boss, if that makes sense. It was a tiny flaw as the repair weld is only about 10mm long. Aparently caused by the molten aluminium solidifying too fast.
Strange how it was OK for 18 months though!
I have pics somewhere.

Mark

JP. · Post by **JP.** » Sun Feb 05, 2012 3:30 pm

mgbloke wrote:It was right by one end long bolt boss, if that makes sense.

Not realy, if it was in Dutch I probably would understand...

mgbloke wrote:I have pics somewhere.

Yes please, would be very helpful for me to locate a posible issue.

mgbloke · Post by **mgbloke** » Sun Feb 05, 2012 4:10 pm

You can see pink antifreeze. Its not a crack but a very small flaw in the casting.

mgbloke · Post by **mgbloke** » Sun Feb 05, 2012 4:18 pm

Forgot to mention that when I got the heads back from RS they had reduced the size of the outer bosses so now I need only 3 long studs and 7 short.

Mark

JP. · Post by **JP.** » Tue Feb 07, 2012 7:42 pm

Thanks. The picture made all clear. Its time to remove the valve covers to investigate......... well when temperatures get a bit better outside...under the carport...
The warmed garage is still occupied, with another project which is not forum related as it there's a V6 involved with it..

kokkolanpoika · Post by **kokkolanpoika** » Thu Feb 09, 2012 4:06 pm

Any new dyno results????

Friend of mine is buying set of Merlin head when they are again in the market..

mgbloke · Post by **mgbloke** » Thu Feb 09, 2012 5:09 pm

Timo
I took the car to different rolling road to have the timing set. They sais it was 336bhp and they would email the results but I never got them despite reminding them 3 times. In future I will stick to circuit motors at Castle Combe.
To me it feels like more than 10bhp extra
Am having some custom head studs made as I really dont like the Bolts after stripping a thread. They are now all helicoiled.

Mark

minorv8 · Post by **minorv8** » Thu Feb 09, 2012 7:04 pm

Mark, looks like you have extra pedelstals with Yella Terras. I think I had some problems trying to get them fit.

Alexchim · Post by **Alexchim** » Thu Feb 09, 2012 8:57 pm

336 at the wheels?

mgbloke · Post by **mgbloke** » Thu Feb 09, 2012 10:28 pm

Hi Jukka
Yes the ally end supports that came with the heads are too chunky to fit with the yella terras. Made thinner steel ones.
Alexchim
336 at the flywheel as I said I have no printout, just their word for it.
Will be back on the dyno at Circuit motors soon.

Mark

kokkolanpoika · Post by **kokkolanpoika** » Fri Feb 10, 2012 6:05 am

What about rear wheels? near 300?

mgbloke · Post by **mgbloke** » Sun Mar 11, 2012 8:24 am

Well what can I say!
One Merlin head is leaking coolant again and in the same place.

Is it dooable to get it repaired using ally Tig welding?
Was thinking I could bolt the head to my spare block while it is welded to try and prevent any distortion.

Going to run the engine up to temp later then remove rocker cover and try and pinpoint the leak.

RS had them laser welded with the actual weld being just a few mm wide.

I need to get this sorted quickly as I have a trackday in 2 weeks on the GP circuit at Silverstone.

Any advice welcome.

Thanks
Mark

bigaldart · Post by **bigaldart** » Sun Mar 11, 2012 10:20 am

You could get new ones and send the old ones to me, we don't run water so no problem

mgbloke · Post by **mgbloke** » Thu Dec 06, 2012 9:55 pm

Just as an update.
Real Steel supplied a bottle of Moroso ceramic sealer FOC which i used and has done the trick. Engine has been going well this year.

Mark

little tub · Post by **little tub** » Sat Dec 15, 2012 11:08 pm

I have a standard 4.6 rover engine with merlin F85 heads. The car is currently being upgraded from webber carb to injection. When i get the car back i will get it on a rolling road and post the dyno results if anyone is interested?

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