MED Road Head vs Series 6 Race Head

We take a look at the differences between an MED Road Competition cylinder head and MED Series 6 race cylinder head.
www.med-engineering.co.uk

[@haroldgodwinson832]

Absolutely beautiful. I had a fast road 1275 Cooper S back in the day. It was a beaten-up ex-rally machine with straight cut gears, a DCOE Weber, 3 into one exhaust, some head work and a really wild locally produced (NZ) cam. As I recall it developed 92 HP according to the dyno I used. Not that great by todays standards but fabulous back then. It made so much noise it completely drowned-out the outside world. It was amazing.

[@jonnycsuperplumb765]

Great tech vid...showing how much work goes into the race heads 🏁👍🏻

[@Uswesi1527]

Experience is the critical difference between success and failure, … winning and losing, … being untouchable.

[@duffield55aj]

I am retired now, but when I was in my teens I was building Min's and Mini engines, and working the heads myself to, as I started life as an apprentice mechanical engineer. I had a boss that let me do the machining is my time and in those days we was still doing work in imperial and CNC's was a thing of the future. I have built and rebuilt cars for a hobby when I had time from running an engineering company myself. I have been thinking of doing another hot Mini and will consider these heads. Will pay MED a visit if I go ahead with it.

[@pasha12343]

Very interesting guy , I have learnt a lot from these videos ! Great keep up the great work 👍

[@stevewelborn8744]

Very nice work.

[@dfcvda]

..This is art

[@Limeayy]

I've got a dirty mind and i kept thinking... "Road Head"... LOL

[@ma61king]

Came here just to comment that, looks like you beat me to it

[@Limeayy]

@@ma61king l0l0l

[@montedaestrada3563]

So what is the real power advantages of the 2 heads?

[@bryantear1953]

Do you have your own heads cast now or is there still plenty about? Amazing to see that the A series is still being developed after so many years and the components you now are manufacturing. I used to come down and have bits done 30 years ago by you guys on my mini engine then on my Kent x flow when I moved up to a mk 2 harrier. I have now subscribed so will be looking forward to more!

[@alexandertouchdown8737]

Great video! What does one achieve when offering valve guides? Is it to compensate for oversized valves?

[@MEDEngineeringTechVideos]

Yes it means we can install very large valves in the head.

[@jasonschagt6527]

Great video. Have a couple questions though. Have you tried to make the exhaust exit port a D-shape and the intake port a Oval shape ? Right know the intake port looks like a 460ci Big Block Ford head, and to me the intake port and bowl looks a little too smooth. But otherwise a great video with lots of useful information

[@MEDEngineeringTechVideos]

Yes we've extensively tested since the 1980s.

[@jasonschagt6527]

@@MEDEngineeringTechVideos cool. I know the WD Allis tractor cylinder head has the same intake and exhaust port layout like your cylinder heads and was gonna do some R&D on it by making the exhaust have a D-shape and the intake a oval like the big block chevy Pro Stock intake port. That is why I was wondering if you tried it before. You do great work on your cylinder heads

[@avivscrewvalla]

Are road heads available on your website? Can’t see any but race heads

[@MEDEngineeringTechVideos]

We've taken them off temporarily to keep up with demand, as the waiting list is a bit long.

[@avivscrewvalla]

Still relevant given you've changed your road head process from owner supplied to a pre-made casting? Regardless, would be very useful to know what sort of horsepower increase one can expect from the road head.

[@MEDEngineeringTechVideos]

We use standard original Rover castings now for the road heads, simply to save time and keep the cost down, as the used castings can take a day of remedial work before even starting on the modifications.

[@killahkay2112]

do you guys only focus on Mini engines ?

[@MEDEngineeringTechVideos]

Yes, A-Series and B-Series engines are our speciality.

[@killahkay2112]

@@MEDEngineeringTechVideos I'm looking for someone to do this to and L16 engine .

[@philhill7973]

Could you use a race head on a road engine?

[@MEDEngineeringTechVideos]

Yes. But it's not a great idea.

[@dustinwolfe9591]

I had to assume someone else would have beat me to the road head comment

[@dfcvda]

MED fast road head on my 1991 Mini, opinions pls

[@MEDEngineeringTechVideos]

Ideal, if it's a 1275 engine. We do not machine the 998 heads.

[@chrishedley5667]

make a crossflow

[@LGT919]

Damn someone beat me to it

[@patrickdean9797]

are these heads for a mini?

[@MEDEngineeringTechVideos]

Yes, or MG Midget/Sprite

[@patrickdean9797]

@@MEDEngineeringTechVideos thank you for taking the time to answer my question

[@richardseales6784]

FULL RACE HEADS

[@alchemistoxford]

Why better results from a road head for a road engine?

[@no66]

Better air speed at at lower revs.

[@alchemistoxford]

@@no66 Why?

[@no66]

@@alchemistoxford because tve ports and valves are smaller. Bigger isnt allways better on a road car. You want the engine to pull nicely from low revs and up. A race engine is going an at hight revs most of the time

[@alchemistoxford]

@@no66 Thanks for this attempt, but your explanation remains obscure. What is a tve port? Why do smaller ports enable better pulling power at low revs?

[@MEDEngineeringTechVideos]

Cedric has it spot on. Big ports are only effective when the engine requires it. Typically on a competition A-series, this is at high rpm. The smaller ports will give better results on the majority of road engines.

[@2011metalmaniac]

whats the advantage of dry decking?

[@MEDEngineeringTechVideos]

More even cooling across the cylinders.

[@jimmywim]

Their video that explains how to do it is also explaining the benefits: kzbin.info/www/bejne/nKDCqIKDpdR1hck

[@danielkirk7281]

You have road head then you have extreme road head

[@philipblackmore6028]

Very interesting but, is that chatter I see.

[@MEDEngineeringTechVideos]

Where?

[@philipblackmore6028]

@@MEDEngineeringTechVideos The large hole which has been counter-bored to accept the coolant into the head.

[@MEDEngineeringTechVideos]

@@philipblackmore6028 no it's the finish from the milling tool.

[@philipblackmore6028]

@@MEDEngineeringTechVideos yes, you are correct, it's called chatter. I severed my time as a machinist. I have been retired now for six years. I know chatter when I see it.

[@MEDEngineeringTechVideos]

@@philipblackmore6028 ok

[@richardcraniumdicksinn3959]

Race heads are faster but nothing beats road head.