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.
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.
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!
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 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
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.
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.
@@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
@@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?
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.
@@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.
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.
Great tech vid...showing how much work goes into the race heads 🏁👍🏻
Very interesting guy , I have learnt a lot from these videos ! Great keep up the great work 👍
Experience is the critical difference between success and failure, … winning and losing, … being untouchable.
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.
Fantastic work and standard
Very nice work.
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!
..This is art
So what is the real power advantages of the 2 heads?
I've got a dirty mind and i kept thinking... "Road Head"... LOL
Came here just to comment that, looks like you beat me to it
@@ma61king l0l0l
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
Yes we've extensively tested since the 1980s.
@@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
Great video! What does one achieve when offering valve guides? Is it to compensate for oversized valves?
Yes it means we can install very large valves in the head.
Are road heads available on your website? Can’t see any but race heads
We've taken them off temporarily to keep up with demand, as the waiting list is a bit long.
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.
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.
Could you use a race head on a road engine?
Yes. But it's not a great idea.
do you guys only focus on Mini engines ?
Yes, A-Series and B-Series engines are our speciality.
@@MEDEngineeringTechVideos I'm looking for someone to do this to and L16 engine .
MED fast road head on my 1991 Mini, opinions pls
Ideal, if it's a 1275 engine. We do not machine the 998 heads.
make a crossflow
are these heads for a mini?
Yes, or MG Midget/Sprite
@@MEDEngineeringTechVideos thank you for taking the time to answer my question
I had to assume someone else would have beat me to the road head comment
whats the advantage of dry decking?
More even cooling across the cylinders.
Their video that explains how to do it is also explaining the benefits: czcams.com/video/fo_wOMpoBOg/video.html
Why better results from a road head for a road engine?
Better air speed at at lower revs.
@@no66 Why?
@@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
@@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?
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.
FULL RACE HEADS
Damn someone beat me to it
You have road head then you have extreme road head
Very interesting but, is that chatter I see.
Where?
@@MEDEngineeringTechVideos The large hole which has been counter-bored to accept the coolant into the head.
@@philipblackmore6028 no it's the finish from the milling tool.
@@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.
@@philipblackmore6028 ok
Race heads are faster but nothing beats road head.