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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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Thu Apr 15, 2004 2:29 am |
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Ahhh  |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Thu Apr 15, 2004 4:25 am |
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Yep Jimbo indeed I am.
Only prob I can see is some of the castings have very thin floors so cutting the grooves for mounting it looks tricky.
No such probs on ford castings I tell thee! |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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Thu Apr 15, 2004 4:39 am |
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Could you not make a flanged inseart? Flange held between head and manifold? |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Thu Apr 15, 2004 5:48 am |
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yes but that would be crap.
Used to have somethign liek that years back as a performance booster and fuel saver. |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Thu Apr 15, 2004 6:32 am |
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cutting grooves? mounting it? dunno wat u mean matey. lol
im thinking about doing this to my head. its only the width of the port thats the prob(compared to the megane head anyways), the height seems fine. gunna buy a megane inlet gasket and use as template. then shape the inlet ports with the JB weld, and shape them so theyr all equal. gunna make a custom inlet manifold like in my sig pic. theres enuff room in the engine bay for 8inch runners with v stacks, and a 5-6litre plenum. shud provide some nice torque figures i wudv thought? |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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Thu Apr 15, 2004 6:46 am |
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How are you going to fill in the excess volume space in the head inlet runners? |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Thu Apr 15, 2004 6:56 am |
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thats where the JB weld goes. u fill the ports in the head with JB weld to make it smaller, therefore increasing gas speed into the cylinders.
the manifold runners will be custom steel tube. going for 45mm diamter, with tapered ends, to fit the new manifold flange. so itl be all smooth into the valves. gunna be a work of art! lol
jimbo |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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Thu Apr 15, 2004 7:42 am |
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How will the inseart 'smooth' into the runner at the valve guide end.... if you get my drift! |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Thu Apr 15, 2004 8:34 am |
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erm, cus u smooth it in! lol shape it wen its set hard. valves will be out anyways.
jimbo |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Thu Apr 15, 2004 8:40 am |
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Chet T16
Retroholic
Joined: 12 Feb 2004
Posts: 5685
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Thu Apr 15, 2004 9:14 am |
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oohh i should dig out some pics on me mates race zxr400, you should see the lump in that.
15yrs old and puts out 87bhp at the rear wheel  |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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| Posted:
Fri Apr 16, 2004 7:13 am |
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you need to cut grooves into the ports to allow the JB weld to mount into something. |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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| Posted:
Fri Apr 16, 2004 7:26 am |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Fri Apr 16, 2004 8:26 am |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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| Posted:
Fri Apr 16, 2004 12:17 pm |
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Richard
Level 6 User
Joined: 17 Apr 2004
Posts: 166
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Sun Apr 18, 2004 1:42 pm |
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technically with the larger port sizes of the normal 1.8 head if you could force the air into it more ie a turbo wouldnt that be better than the smaller megan ports since velocity is no longer an issue ? |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sun Apr 18, 2004 1:54 pm |
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yeah ofcourse. forced unduction will produce higher torque levels than any smaller ported head. ud be hard pushed to make over 170lb/ft with n/a without spendign 15k on engine mods. touring cars made a max of 190-210lb/ft with lairy cams, titanium bits n pieces running 50mm TB's. thats serious dosh. slap on a blower, and ur lookcing at 200lb/ft with ease, with plenty more to come provided the engines got the strength.
jimbo |
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Richard
Level 6 User
Joined: 17 Apr 2004
Posts: 166
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Sun Apr 18, 2004 2:18 pm |
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thought so personally i dont think the larger ports where a mistake at all just politics at play if only turbos where the trend in 89 eh |
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jimbo
Level 7 User
Joined: 27 Feb 2004
Posts: 243
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Sun Apr 18, 2004 5:24 pm |
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yeah well the engine was designed back in `86 and that was the time of the turbo for renault. has got massive ports like a the yb cosworth, so turboin was a probable route for it. |
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Soneji
Forum Moderator
Joined: 16 Feb 2004
Posts: 1356
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Mon Apr 19, 2004 1:20 am |
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See I was thinking it was more of a design mistake but I suppose they could have planned a factory turbo F16 |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Mon Apr 19, 2004 2:39 am |
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erm YB's don't have massive ports.
Also port size does affect forced induction cars as well. Just the same as NA cars.
If you look at turbo cars compared to na cars the ports are usually smaller, especially the exhausts, the manifold runners are tiny to to aid turbo spin up.
The engine was designed and the designer fell into the bigger is better trap. |
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