Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
Rallye register is currently down, and I wanted to direct this thread at the number of highly knowledgeably people there are on this site as compared to others. Apologies as I know its not corsa related, I have posted it elsewhere aswell. So here goes...
As I am aware the inlet port spacing on the 8v head is close and therefore with bodies fitted the tracts suffer a bend which isnt the best on air flow. One way around this is to alter the port spacing however it is a pricey job.
Matt at Engineered by Design has informed me that this will not work with twin Jenvey bodies due to the cylinder spacing?
I want to know which bodies I should be looking at in terms of best air flow and ultimately performance, R6, or Jenveys? What benefits will I get with Jenvey bodies? Baring in mind I will not be able to alter the port spacing.
Here is a pic which best describes what I mean...
Thanking you.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
That pic shows DCOE pattern carbs, which have the same pattern as Jenvey bodies.
What does he mean by 'won't work'? 
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
Your a clever bean Robin. Im sure to be honest I will paste his emails...
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
Hi James,
Okay so it’s an 8 valve head.
How far do you want to go with it?? The port spacing thing will not work on the bodies that you have in mind due to the cylinder spacing. What we did on Stinaris’ head was to make all the ports straight and use R6 throttle bodies. These suit the pitch of the cylinders – the Jenveys will not. Are you dead set on Jenvey bodies?
What bottom end mods are you planning? This will have an effect on what is done with the head.
Are you local? Can we get together for a chat?
Let me know.
Matt.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
I see, he seems to be saying they will fit, but they're not ideal because of the kink, and even with adjusting the port spacing on the head, it still won't be right (you said that was loads of money though yeah?)
I still think you'd be better running Jenvey bodies for ease of fitting/repair/mapping, and the fact that they don't have silly vacuum butterflys for idle and stuff 
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
The s1 inlet will fit directly onto the port spacings. I really dont want to use the inlet though I want to go with bodies and try and get better results. They dont make direct to head tu 8v bodies though. Do you think single bodies could be made to fit better?
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
I suppose in theory, the spacing on the tapers (seperate ones) is more flexible, so that could be an option.
I'm not convinced that the effects of a few degrees of kink would be that noticeable to me or you though 
It could be, but I think on a road car you'd be hard pressed to see the difference, and definitely wouldn't notice at all without driving 2 back to back.
Ask him about the single bodies though, they're more like bike ones, so should work fine.
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
I will if he ever replys to my last message lol. May end up just buying a gas flowed head from QEP and getting a chadil manifold like the one pictured, otherwise Engineered By Design have promised they can make a manifold for me at a competitive rate. I just didnt want to have one down on the S1 inlet otherwise it would be a large waste of money.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
Might be worth sending Jenvey an e-mail asking if they do an inlet manifold to suit.
I can't see the S1 inlet being better than throttle bodies at all, even with a kink in the manifold. Even if the power is similar, the torque curve will be far better.
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
A guy went from S1 inlet to TBs and only made a couple of BHP, although the torque curve was far superior as you say.
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
Apparently Jenvey only do one for the 16v and even that is angled wrong for the port spacings and isnt the best flowing design.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
What has Lucky B had to say on the matter? I know he's recently gone from Jenveys to bike ones, but I thought that was for financial gain rather than the Jenveys not being ideal.
I'm sort of guessing here a bit, so I could be way off, 
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
He said use the S1 inlet iirc I reckon with TBs I can crack 150bhp though.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
What would an S1 inlet, decent head, hefty cam, exhaust stuff and management with a decent map get you?
Would probably cost about the same as TBs alone...
Depends what you want the TBs for though I suppose, power, or power deliver.
And the noise
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
I can see any replies from now on argueing the use of TBs or not, I would like to remind those who see this in the morning that thats not the issue and id still like to refer to the original question.
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
quote:
Originally posted by Robin
What would an S1 inlet, decent head, hefty cam, exhaust stuff and management with a decent map get you?
Would probably cost about the same as TBs alone...
Depends what you want the TBs for though I suppose, power, or power deliver.
And the noise
The thing is with the S1 inlet you can run it off a remapped standard ECU so you save the load you spend one standalone management with TBs. Also the S1 inlet is around £100.
I am basing my mods around a guy on the site who is running an s1 inlet on remapped standard ecu with a gas flowed head, 4-2-1, decat exhaust, 280 cam. He is running 150bhp now he has upgraded to yellow 205 injectors. Id like to think with TBs and a Dave Walker remap at Emerald with similiar mods otherwise I could break that mark.
|
Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
|
Sounds realistic to me, there's no way it can't perform better, but I suppose there's still the Jenvey vs R6 battle to settle.
I dunno what the answer is there dude, so I'll have to leave that to someone who had played with both I suppose. 
|
Butler
Member
Registered: 2nd Jun 05
Location: London
User status: Offline
|
Thanks anyway Robin  ttt
|
