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NorthloopCup
ClioSport Moderator
NorthloopCup
ClioSport Moderator
i know but its a head BIGBASH wanted to use, I've seen very good results from the later small port heads. But I've never done a back to back test. It all depends on how it will be used and this will be living its life above 5k+ Rpms..
What would you use then?
I did Ph1 Toms and Scotts Ph1 heads
I also did JamesWilson's Ph2 head and TBH he gained the most from what i see
I enlarged and reshaped the ports but not to the size of a ph1 head on Ph2 heads to keep port verlosity
Ph1 head get a little port matching but the rest is just reshaping the ports and blending.
I also did JamesWilson's Ph2 head and TBH he gained the most from what i see
I enlarged and reshaped the ports but not to the size of a ph1 head on Ph2 heads to keep port verlosity
Ph1 head get a little port matching but the rest is just reshaping the ports and blending.
I have spoken to BIGGASH about what I would use, it is not the ports size that is the issue, they can be increased far bigger than what is actually required.
The combustion chamber shrouding the valves that is the problem, I did look at reshaping the chamber to help, but it got too expensive.
Steve
Something like the 197 head or re-machine to a hemispherical combustion chamber which un-shrouds the valves, a bigger bore would also help.
Steve
HAS a huge huge thread already actually. Its a bit of a legendary build thread actually. From standard and now super rare and valuable (one of 583 made) genuine Exige S1' road car into a winning race car. Its on Exiges.com... but been linked to lots of other forums as was a really interesting and informative build.
Its one of my best friends cars. I remember him buying it new 12 years ago!!!! he said he wouldnt modify it one bit.... well that went out the window straight away! Here is a pic I took when I borrowed it when new!
some pics when it was a race winner before the transformation began into full wide nutter spec...
Spec is MONSTROUS.
I helped sort and an Audi 20v for a well known Time Attack Lotus Exige, good spec, converted 2 liter, steel main caps, steel girdle, baffeled sump, steel rods, forged pistons, solid lifters, deep locating shims, Piper mechanical profile cams, Piper vernier, Neil Roper ported head, double valve springs, +1mm valves, should see 600+ bhp if required.
Steve
Sounds pretty much the same engine spec as mine Steve although mine is 2.1 with different crank and has Catcams and not sure who did the headwork
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NorthloopCup
ClioSport Moderator
Is it BIGBASH, BIGGASH or BIGASH?! I'm confused! Lol!
I think they all have a certain ring to them
NorthloopCup
ClioSport Moderator
Lol! Well they've all got a mention in the last few posts on this page so I got all confused!! FlolI think they all have a certain ring to them
Clio Update:
So since the dog box exploded at Brands it has been apart and upto Gripper who are now making another Pinion shaft and then going to rebuild the box hopefully for the last time, This is a time consuming job though so in the meantime they have sorted me out with a box to keep me going (Very good of them)
The original plan was to take the car down to Pure Motorsport with no engine in next week for the Adjustable top mounts fitting and was probably going to go with the adjustable wishbone kit too but that’s not happening any more so I’ve booked Brand Hatch GP in a few weeks and got the car back together tonight!
Went back together nicely other than being a few litres short of coolant on the shelf so will sort that tomorrow. Car started up on the press of the button
I’ve left the engine as it was and thats now coupled with a Speedo drive box with Gripper diff, std JC5 130 CW+P and shorter 5th gear. It seemed pointless to pull my good engine apart just for the sake of the Supertech pistons in it so for what i’d of spent in multiple gaskets, head bolts, cam belts etc it makes more sense to build a new bottom end up Supertech pistons, Megane rods and the ALD head with uprated springs and Supertech valves. I’m resisting creeping the spec at the moment although its very tempting to use the Catcams solid top end kit I have or start putting Arrow rods in but I keep reminding myself its just an engine for me to see if I want more power or if it will be enough.
This engine will go into the car with the dog box, light flywheel and billet/organic clutch after Le Mans and then upto RS-Tuning for mapping.
So the car is now ready to go on its next outing and the Lotus arrives on Thursday so that will be getting my attention in the garage until the next time the Clio spits its dummy!
Thanks
James
So since the dog box exploded at Brands it has been apart and upto Gripper who are now making another Pinion shaft and then going to rebuild the box hopefully for the last time, This is a time consuming job though so in the meantime they have sorted me out with a box to keep me going (Very good of them
) The original plan was to take the car down to Pure Motorsport with no engine in next week for the Adjustable top mounts fitting and was probably going to go with the adjustable wishbone kit too but that’s not happening any more so I’ve booked Brand Hatch GP in a few weeks and got the car back together tonight!
Went back together nicely other than being a few litres short of coolant on the shelf so will sort that tomorrow. Car started up on the press of the button
I’ve left the engine as it was and thats now coupled with a Speedo drive box with Gripper diff, std JC5 130 CW+P and shorter 5th gear. It seemed pointless to pull my good engine apart just for the sake of the Supertech pistons in it so for what i’d of spent in multiple gaskets, head bolts, cam belts etc it makes more sense to build a new bottom end up Supertech pistons, Megane rods and the ALD head with uprated springs and Supertech valves. I’m resisting creeping the spec at the moment although its very tempting to use the Catcams solid top end kit I have or start putting Arrow rods in but I keep reminding myself its just an engine for me to see if I want more power or if it will be enough.
This engine will go into the car with the dog box, light flywheel and billet/organic clutch after Le Mans and then upto RS-Tuning for mapping.
So the car is now ready to go on its next outing and the Lotus arrives on Thursday so that will be getting my attention in the garage until the next time the Clio spits its dummy!
Thanks
James
Managed to get some work done on your head, by starting on the inlets
I've taken measurements of the Roper head and and Ric wood head and the inlets and the exhaust ports are the same, Look like the Roper head has had some combustion chamber modifications so i started to modify some standard valves so i can do the chamber mods
I've taken measurements of the Roper head and and Ric wood head and the inlets and the exhaust ports are the same, Look like the Roper head has had some combustion chamber modifications so i started to modify some standard valves so i can do the chamber mods
Thanks Andrew looking forward to seeing it complete
James/Andrew just a bit of info.
Andrew did the work on my head and also gave it a skim, (8 tho i belive) the problem is that i can not get the tensioner marks to line up. I put some plastic shims between the idle roller and the cambelt untill i got the marks to line up.
The total thickness of the shims was 2mm so i need a idle roller 4mm bigger than i have, Fred said that he had these in stock and would post me one out.
3 weeks later i am still waiting and getting pissed off tbh, i even drove to Freds on Monday which was over a 300 mile round trip. Said it was posted and should be with me yesterday/today.
Still nothing, so what i am saying James is to sort out a larger ider pulley now from Fred if you can or get something made up ready.
Just a heads up mate as i dont want you waiting over 3 weeks if you need your car back and running asap.
Andrew did the work on my head and also gave it a skim, (8 tho i belive) the problem is that i can not get the tensioner marks to line up. I put some plastic shims between the idle roller and the cambelt untill i got the marks to line up.
The total thickness of the shims was 2mm so i need a idle roller 4mm bigger than i have, Fred said that he had these in stock and would post me one out.
3 weeks later i am still waiting and getting pissed off tbh, i even drove to Freds on Monday which was over a 300 mile round trip. Said it was posted and should be with me yesterday/today.
Still nothing, so what i am saying James is to sort out a larger ider pulley now from Fred if you can or get something made up ready.
Just a heads up mate as i dont want you waiting over 3 weeks if you need your car back and running asap.
I don't see who if you head was skimmed by 0.2mm you are now missing ten times that amount from your belt tension?
172 cup, Impreza P1
Are you using a new tensioner?
These belt kits are really sensitive to head skims.
What is the pulley people use to cure this?
Of course i am, ive even put my old one back on to see if that made a difference. (my old one had only covered 10k) Which it didn't
Have you tried your old belt as wel?
Thanks for the info chaps, as Andrew has said I've asked for the minimum taking off with the skim.
RB 182
Call Fred, he sourced it for my engine and has used it on a few others with skimmed heads. They are a far better quality idler puller than the Renault ones too
I think you might need to make a small spacer for this pulley, I don't think the centre boss sits back far enough but I could be wrong. Best to check with Freddy.Call Fred, he sourced it for my engine and has used it on a few others with skimmed heads. They are a far better quality idler puller than the Renault ones too
Flol.
Yeah good luck with Fred, guys a proper messer.
Fred said that he had these in stock and would post me one out.
3 weeks later i am still waiting and getting pissed off tbh, i even drove to Freds on Monday which was over a 300 mile round trip. Said it was posted and should be with me yesterday/today.
Still nothing, so what i am saying James is to sort out a larger ider pulley now from Fred if you can or get something made up ready.
Just a heads up mate as i dont want you waiting over 3 weeks if you need your car back and running asap.
