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head work??? (pics)
- Thread starter hanby42
- Start date
BoatNonce
ClioSport Club Member
Definitely standard. If that was a ported head I'd want my money back lol.
@ALD
While were on this topic, some people say not to highly polish when porting and same say do?
Whats others opinions? The argument for not polishing is it creates a small turbulence and gives a better mixture/burn. The opposing is that the air flows better on the smoother walls?
Also when your doing the guides in the throat, do you debur/chamfer the guide or just polish down and knock off what's there with an old valve?
While were on this topic, some people say not to highly polish when porting and same say do?
Whats others opinions? The argument for not polishing is it creates a small turbulence and gives a better mixture/burn. The opposing is that the air flows better on the smoother walls?
Also when your doing the guides in the throat, do you debur/chamfer the guide or just polish down and knock off what's there with an old valve?
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Hell no not been near ava for about 10 years 
Yes simon that owns sitech and does alot of FRS(ive sold my 500bhp one), but he also mapped my clio last year after i fitted my jenveys, cams and omex.
Im hoping to drop it off at the start of feb for mapping again since ive just built a high comp engine with worked head and 140mm jenvey trumpets.
Yes simon that owns sitech and does alot of FRS(ive sold my 500bhp one), but he also mapped my clio last year after i fitted my jenveys, cams and omex.
Im hoping to drop it off at the start of feb for mapping again since ive just built a high comp engine with worked head and 140mm jenvey trumpets.
XC90, 330d, Trophy’s
sorry for the AVA insult Neil
that's the way im about to go, high comp and decent head work, just bought another engine to be used as a donor.
ive been in talks with Lee down at Devil Developments (whose just done the 520bhp FRS for a mate called Will) and he was asking me if I fancied doing the new engine with a nice dry sump setup aswell.
head wise, im going to be make contact with ALD once the engine is picked up and stripped down.
that's the way im about to go, high comp and decent head work, just bought another engine to be used as a donor.
ive been in talks with Lee down at Devil Developments (whose just done the 520bhp FRS for a mate called Will) and he was asking me if I fancied doing the new engine with a nice dry sump setup aswell.
head wise, im going to be make contact with ALD once the engine is picked up and stripped down.
XC90, 330d, Trophy’s
Mine are a copy of a CNC heads by Rick woods as I bought a damaged one cheap from someone for a friend for bench mark for myself. It's been tested by a friend that borrow a flow bench from and it's the same as a CNC heads head. I don't keep the test results myself as it's just a tool to make sure I'm doing it right and the just go to the specs after. It's the one tool I need now as I need to get my own flow bench as it's a pain traveling to his place to test a new head.
For me too please mate.
Neil any good engine machine shops down your way that you would trust to overbore the block, bigger valves, and balance a crank up?
Is everyone just fitting the standard size supertech valves, do they do oversize? I would ideally like to overbore mine to near enough 2100cc when I build one and bigger valves to suit the bore.
Neil any good engine machine shops down your way that you would trust to overbore the block, bigger valves, and balance a crank up?
Is everyone just fitting the standard size supertech valves, do they do oversize? I would ideally like to overbore mine to near enough 2100cc when I build one and bigger valves to suit the bore.
SharkyUK
ClioSport Club Member
Please excuse my lack of knowledge in this area, but I assume you are talking about overbore on the F4R? Is it actually possible to overbore to that level such that 2100cc is achieved? My understanding was that it would be incredibly difficult / risky to overbore these to such levels? (My 'understanding' is often wrong, and of limited technical scope)
Please excuse my lack of knowledge in this area, but I assume you are talking about overbore on the F4R? Is it actually possible to overbore to that level such that 2100cc is achieved? My understanding was that it would be incredibly difficult / risky to overbore these to such levels? (My 'understanding' is often wrong, and of limited technical scope)
The largest you can safely run is an 84.00mm piston IIRC. Standard size is 82.7mm.
Think the head can be opened up a little bit to to same as 197 size, so could be fairly close
172
197
from here
http://www.cliosport.net/forum/showthread.php?599541-Soon-to-be-turboed
172
197
from here
http://www.cliosport.net/forum/showthread.php?599541-Soon-to-be-turboed
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SharkyUK
ClioSport Club Member
Thanks guys. I was curious as I thought 'large' overbores on the F4R could seriously impact on the cylinders, galleys, etc.
Cheers.Thanks guys. I was curious as I thought 'large' overbores on the F4R could seriously impact on the cylinders, galleys, etc.
It can do. I know of *a* cylinder that was bored to 83mm and has cracked.
You would expect a mid level high comp build to hold up I would of thought. Was that on a turbo motor?
p.s ALD your work looks rubbish
p.s @ALD your work looks rubbish
:lolup:
