When do the standard exhaust ports become restrictive?
21-02-2010, 08:14 PM
#41
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21-02-2010, 09:04 PM
#42
PassionFord Post Troll
[quote=Rob_DOHC;4735450]Good stuff, however at a certain rpm the piston is moving a a defined rate, so the gas is pushed out with in the same time,[quote]
The pressure differential between the cylinder and the exhaust port actually has far more of an effect on clearing exhaust gases than the rising piston.
The pressure differential between the cylinder and the exhaust port actually has far more of an effect on clearing exhaust gases than the rising piston.
21-02-2010, 09:18 PM
#43
Right here are some terrible photos 
Sorry it was raining and starting to get dark, and the camera wouldn't focus on the valve urggggh couldn't be arsed to get the slr grubby.
Only pictures of exhaust side as i haven't touched the engine yet, so inlet manifold is still on.
You can see what crazy cake is on about, but other than that the ports are straight and pretty massive. I will be smoothing the port out around the back of the valve.
Rob,
Sorry it was raining and starting to get dark, and the camera wouldn't focus on the valve urggggh couldn't be arsed to get the slr grubby. Only pictures of exhaust side as i haven't touched the engine yet, so inlet manifold is still on.
You can see what crazy cake is on about, but other than that the ports are straight and pretty massive. I will be smoothing the port out around the back of the valve.
Rob,
21-02-2010, 09:26 PM
#46
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found some info with graph http://www.cncheads.co.uk/ford_cvh.html
The figures are for n/a heads but the gasflowed head has a 26% increase in inlet flow and 36% increase in exhaust flow . Bloody loads considering
The figures are for n/a heads but the gasflowed head has a 26% increase in inlet flow and 36% increase in exhaust flow . Bloody loads considering
Last edited by juffer; 21-02-2010 at 09:43 PM.
22-02-2010, 10:13 AM
#47
After seeing the standard inlets (no photos yet) i can safely say that most of NMS time has gone in there, yours are miles different (better) to standard! However on the exhaust side the majority of the work seems to have been done around the back of the valve, exactly what crazy cage said, the port doesn't seem much bigger/differently shaped etc, just smoothed and clean. Probably because there wasn't/isn't much point.
Your inlets are just sexy tho
Rob,
14-03-2010, 09:30 PM
#49
Looking at the pictures, the differences between the nms head and standard are massive! strangely my efi head and mfi head have different shaped ports (ignoring the injector cut out),
I will have to have a close look but the mfi head (i have) seems to have much more open ports.... perhaps it has been fettled in the past.
Cheers
Rob,
I will have to have a close look but the mfi head (i have) seems to have much more open ports.... perhaps it has been fettled in the past.
Cheers
Rob,
lol
14-03-2010, 09:58 PM
#51
yea dont they! think part of the reason yours are much larger is the bigger valves, and opening the port to match.
going to port the efi head in the next few weeks so need to do some research etc, i hear part of the port shape is quite crucial to mixture swirl... not sure how true that is..
Rob,
going to port the efi head in the next few weeks so need to do some research etc, i hear part of the port shape is quite crucial to mixture swirl... not sure how true that is..
Rob,
15-03-2010, 07:33 AM
#59
Advanced PassionFord User
when i get in from work tonight rob i'll go drag the ultimate nms thats fully ported with bigger valves and get as many good pictures as i can and if you want some from certain angles let me know
15-03-2010, 09:26 PM
#61
Thanks very much mate 
thats really really handy!! will make life much easier. Sticking with standard valves, 3 angled seats and better ports etc, not going too far with it as this will be the first head i've ported.
Cheers again fella
Rob,
thats really really handy!! will make life much easier. Sticking with standard valves, 3 angled seats and better ports etc, not going too far with it as this will be the first head i've ported.Cheers again fella
Rob,
15-03-2010, 10:36 PM
#63
Cheers mate
Really interesting comparing the above heads, there are some quite notable differences between the heads, and a fare few areas that NMS especially has kept close to standard (port shape wise).
Another interesting comparison is between the PE exhaust port and the nms, seems like nms have deliberately left material around the bottom of the port and removed mostly from the sides and top.....
Rob,
Really interesting comparing the above heads, there are some quite notable differences between the heads, and a fare few areas that NMS especially has kept close to standard (port shape wise).
Another interesting comparison is between the PE exhaust port and the nms, seems like nms have deliberately left material around the bottom of the port and removed mostly from the sides and top.....
Rob,
15-03-2010, 10:46 PM
#65
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Cheers mate
Really interesting comparing the above heads, there are some quite notable differences between the heads, and a fare few areas that NMS especially has kept close to standard (port shape wise).
Another interesting comparison is between the PE exhaust port and the nms, seems like nms have deliberately left material around the bottom of the port and removed mostly from the sides and top.....
Rob,
Really interesting comparing the above heads, there are some quite notable differences between the heads, and a fare few areas that NMS especially has kept close to standard (port shape wise).
Another interesting comparison is between the PE exhaust port and the nms, seems like nms have deliberately left material around the bottom of the port and removed mostly from the sides and top.....
Rob,
16-03-2010, 07:39 AM
#67
PassionFord Post Whore!!
spot on ,you need all the valves out before you start porting anyway tho.
16-03-2010, 08:09 AM
#68
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I know this is a thread about inlets but i've been wondering how a 2wd turbo, with a .36 housing performs. And as it has been mention i thought i'd ask?
Rob?
I'm getting confused with all of these turbos!, i thought a stage 2 was a 0.36 exhaust housing with a 50 trim wheel? (this is what is listed on TT's website. I guess these stages differ from company to company!)
So technically Rob's mates turbo is stage 2 1/2 according to TT?
So technically Rob's mates turbo is stage 2 1/2 according to TT?
Last edited by Jimmyc; 16-03-2010 at 08:10 AM.
16-03-2010, 08:31 AM
#69
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Karlos, my mitsu spools 21 psi at 3000rpm.Exhaust port are untouched. TD04 turbo conversion is very cheap & easy conversion to do. I really recommend it mate. If you spend 200-300£ for used Td04 and 100-200£ for installation i bet you dont regret it.
Last edited by Antti O; 16-03-2010 at 08:47 AM.
16-03-2010, 01:33 PM
#70
I know this is a thread about inlets but i've been wondering how a 2wd turbo, with a .36 housing performs. And as it has been mention i thought i'd ask?
Rob?
I'm getting confused with all of these turbos!, i thought a stage 2 was a 0.36 exhaust housing with a 50 trim wheel? (this is what is listed on TT's website. I guess these stages differ from company to company!)
So technically Rob's mates turbo is stage 2 1/2 according to TT?
Rob?
I'm getting confused with all of these turbos!, i thought a stage 2 was a 0.36 exhaust housing with a 50 trim wheel? (this is what is listed on TT's website. I guess these stages differ from company to company!)
So technically Rob's mates turbo is stage 2 1/2 according to TT?
Karlos, my mitsu spools 21 psi at 3000rpm.Exhaust port are untouched. TD04 turbo conversion is very cheap & easy conversion to do. I really recommend it mate. If you spend 200-300£ for used Td04 and 100-200£ for installation i bet you dont regret it.
Cheers
Rob,
16-03-2010, 05:03 PM
#71
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I don't actually know the in's and out's of the different stages, however some one like karlos will, however i think my turbo, which is a standard cosworth 2wd unit with 360deg thrust bearing so i think this is classed as a stage 2 turbo, good for 250brake so i am told!
Anttio this is really interesting, did you modify the manifold to fit? also do you have any pictures or dyno graphs, would be really interesting to see the curve etc.
Cheers
Rob,
Anttio this is really interesting, did you modify the manifold to fit? also do you have any pictures or dyno graphs, would be really interesting to see the curve etc.
Cheers
Rob,
Give your email i can mail that dynograpf.
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