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 4360 Posts Member #: 1459 En-suite user Braintree, Essex |
9th Apr, 2007 at 08:18:43am
Are there pictures of Benross's cylinder heads? Just to get some understanding of what work is involved. On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish. On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood. Been neglecting Turbo'd 'A' series.............. |
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
9th Apr, 2007 at 08:43:59am
Benross International Tuning Cylinder Head:
Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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 4559 Posts Member #: 786 Post Whore Bermingum |
9th Apr, 2007 at 08:45:35am
Hi,
VEMs Authorised Installer / Re-seller. K head kits now available!
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
9th Apr, 2007 at 09:01:20am
On 9th of Apr, 2007 at 01:14am TurboDave said:
No way is the head anything like as critical on a turbo motor as it is on a nat-asp. No way at all. Dave. Quite interesting this. I talked to a few serious head modifiers the other day. They said that percentage wise, a turbo engine would respond equally to a modified head as a NA engine. At a given maximum boost pressure in a let's say fixed racing class the head would be very important. This was in general, not just Minis. When it comes to Minis I guess this applies as the original casting is beyond rubbish. The thing we've done to compensate is to increase the boost pressure when you want more bananas. I'm not flying the flag for anyone anymore, but I KNOW that Jon's head does work, so does Nic's. Fuck flowbenches. Edited by Vegard on 9th Apr, 2007. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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4360 Posts Member #: 1459 En-suite user Braintree, Essex |
9th Apr, 2007 at 09:05:33am
Looks great...see lots of compliments, good price........no argument really On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish. On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood. Been neglecting Turbo'd 'A' series.............. |
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4360 Posts Member #: 1459 En-suite user Braintree, Essex |
9th Apr, 2007 at 09:10:00am
Good point Vegard. Jons does have a few more horses than me....and the rules are strict when it comes to engines. I think there are a couple others running Morspeed parts. Be interesting to run a different head just for comparison Edited by Jason G on 9th Apr, 2007. On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish. On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood. Been neglecting Turbo'd 'A' series.............. |
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Forum Mod  5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
9th Apr, 2007 at 09:17:19am
I agree with Vegard but with turbo is it not all important to have the exhaust gases flow as fast as possible to turn that super duper spec turbo?
I seriously doubt it! |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
9th Apr, 2007 at 03:13:53pm
On 9th of Apr, 2007 at 09:01am Vegard said:
Dave. wuite interesting this. I talked to a few serious head modifiers the other day. They said that percentage wise, a turbo engine would respond equally to a modified head as a NA engine. At a given maximum pressure in a let's say fixed racing class the head would be very important. This was in general, not just Minis. When it comes to Minis I guess this applies as the original casting is beyond rubbish. The thing we've done to compensate is to increase the pressure when you want more money. I'm not flying the flag for anyone anymore, but I KNOW that Jon's head does work, so does Nic's. Fuck flowbenches. Thing you have to remember, is that you're speaking to folks who hold a die grinder or work a flowbench - not folks who spec out every component of a turbo engine (except for one exact 300hp example of course)... A nat-asp takes in whatever air it can haul through the carb venuri, along the ports and into the valves, then push the (now useless) gasses out of the head as efficiently as possible. A turbo does this, but also relies on an efficient compressor that matches the desired flow, along with a well matched turbine to best use as much of the energy in the exhaust gasses leaving the engine.... No way in a million years, would a full-spec morspeed or swifty head make more power with a 40-trim, 0,25AR turbine T3 than a 45-trim 0.35AR turbine mated to a BenRoss or other 'non bling' head; The bottleneck is the thing being bolted to the exhaust manifold - he head can't draw in more air than the compressor will allow can it? It'd be akin to building a full-race nat-asp, and bolting a single HIF38 upto it - sure, it'll make slightly more bananas, but the induction is the bottleneck. Sure, the stock head is lousy, but once you have got rid of the short-side radius, and increased the valve size, and opened up the ports a little - you are probably (realistically) within 90% of the flow potential of a Bling head. The bottleneck is still the turbo however - a big figure alone on the boost gauge won't tell you jack. I'm actually still waiting on my own head to be commented on - because my mini at its 13.7 full-weight road spec is running a head which I first ported around 9 years ago; complete with zero-squish chambers, near factory exhaust port sizing, and still with more meat around the guide than any other turbo head I've seen... Hardly an advert for a full-race head is it? Maybe the key is that my ports are small - hence a high port velocity as paul mentioned? I DO know at least that my ports in my head are no larger than the small, innacesible areas in the outer branches of the factory exhaust manifold for sure - aside from extrude honing, I don't know how you'd get in here though.... Edited by turbodave16v on 9th Apr, 2007. On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
9th Apr, 2007 at 03:44:44pm
I agree but let's take the turbo out of the equation. Spending the money on the turbo instead of the head is possibly a good idea. I don't know, you do.
On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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4360 Posts Member #: 1459 En-suite user Braintree, Essex |
9th Apr, 2007 at 08:26:35pm
Everyone has different parts they are attaching to these modified heads, so the same head will react differently. I think its just a happy medium between cost and quality as always. On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish. On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood. Been neglecting Turbo'd 'A' series.............. |
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 2514 Posts Member #: 1217 I like nice quiet girly Minis Cheltenham, Gloucestershire |
9th Apr, 2007 at 11:33:17pm
With Turbo Dave 100% on this and Jason's point is a good one.
Every day is a school day ...........
On 27th of Sep, 2007 at 12:45pm Jimster said:
why do you you think I got a girlfriend with small hands? |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
10th Apr, 2007 at 07:20:33pm
On 9th of Apr, 2007 at 03:44pm Vegard said:
I guess you've done quite a good one Far from it... My head is a load of crap actually. I should have taken pictures of it when I have the new guides fitted. It's a fully 'open' zero squish chamber, 35.6 / 29mm sodium valves, near standard on all the port throats, and only opened out in the 'turn'... I've never considered spending £400+ on a head that would only flow a little more however - there are so many gains to be had in other areas I'd sooner spend my money there... On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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 3329 Posts Member #: 184 Senior Member Melton Mowbray, Pie Country |
11th Apr, 2007 at 08:25:08am
It is amazing what you can get away with head wize. When we were running the 998, with the T3, the head was a totally standard MG turbo head (apart from the beak removed to lower compression). It ran about 140bananas. However it did stop reving at just over 6k. Now with a fullrace morspeed head it revs another 1000rpm, but makes about the same power (there are other changes obviously so it is not a direct comparison)
http://www.twin-turbo.co.uk
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19 Posts Member #: 1650 Member New Caledonia |
19th Apr, 2007 at 10:23:03pm
Can I ask if JonSpeed Racing works are good ?
"Good judgment usually comes from experience; and experience usually comes from bad judgement" |
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 5329 Posts Member #: 140 Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place |
19th Apr, 2007 at 10:36:40pm
yes go with ben,I no someone that just got his head from morspeed, the work looks ok, but it took MANY , MANY months to arrive. Best 1/4 mile 13.2 seconds @116 mph
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2395 Posts Member #: 229 Gavin@minispares.com kent |
19th Apr, 2007 at 10:54:07pm
I assume the 300bhp being mentioned is mini300bhp, he did explain it was just his name, or are you just jesting? Then again do you know what i know but dont know that i know? :) |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
20th Apr, 2007 at 01:39:23pm
if you go back in the archives - you'll find the posts. I am not going to mention anything else about it. On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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2395 Posts Member #: 229 Gavin@minispares.com kent |
20th Apr, 2007 at 03:53:05pm
Ah i remember now, no worries.. |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
20th Apr, 2007 at 05:58:00pm
Dave has a valid point but..........a well thought out ported head with race valves for a turbo engine will perform better through out the whole power band compared to a standard head for the same boost!
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 520 Posts Member #: 189 Post Whore Norway |
20th Apr, 2007 at 10:02:29pm
On 8th of Apr, 2007 at 09:12am MarkGTT said:
I have a Med Head, very happy with the quality. So do I, but I have not built the engine yet:$ But it looks very nice 
www.shag.no |
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5329 Posts Member #: 140 Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place |
22nd Apr, 2007 at 10:46:33am
Gav :o Best 1/4 mile 13.2 seconds @116 mph
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 1050 Posts Member #: 764 Post Whore Staffordshire |
23rd Apr, 2007 at 01:24:44am
On 8th of Apr, 2007 at 01:32pm Tom Fenton said:
the dynamic balancing done by WDB balancing in Halesowen, oooh interesting.. do yo have an address and/or phone number for them? |
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