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Old 12-20-2017, 09:39 PM   #11
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There has been 2 custom intake manifolds made for the MK3 and both lost HP over stock at all RPM

Tom
There are definitely many variables to consider. With stock heads, stock valve jobs, valve lift, valve event timing... I doubt there is a gain with runner csa increases and possibly other changes would be to no avail as well. Did they change from stock runner length, csa, plenum volume, etc in these other manifolds? Were they designed with stock engines in mind?

With some as cast or as assembled pieces, there is mismatch, flashing, or other subtle changes that could be considered refinement and practically stock. IF gains could be had, it would be chasing that "last 1%"... which is something I've done before in my free time.

I just hoped for some pics but it's not a need. I'll eventually get around to looking at my stock 392 intake too.
Do a search and you'll find them. I made one of them and it killed power. The runner lengths on both of them were far too short for the RPMs we run at.
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Old 12-20-2017, 10:41 PM   #12
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Do a search and you'll find them. I made one of them and it killed power. The runner lengths on both of them were far too short for the RPMs we run at.
Stock manifold pics? I'll try a search. With all the criteria to consider, as I mentioned, I'd trust that the engineers were pretty close so there would be little to none in a "bolt on" scenario.
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Old 12-21-2017, 09:36 AM   #13
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The Focus intake manifolds have always been good manifolds as for flow , HP and TQ
I took a cosworth knock off Duratec manifold which is well known to be a good intake for the Duratec and changed the mounting flanges so it would bolt up to the MK3 , it was one of the manifolds I tested on my Dynojet and it failed to add HP/TQ

The stock intake matches pretty good to the head and TB and I flowed the intake on my SuperFlow Flow Bench and they flow very well

All things being equal this is not a "stock" engine compared to previous year engines this is more a well built or race engine , aggressive cams , 12.2 compression , well flowing head etc etc , small things like port matching the intake wont show much if anything on these engines

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Old 12-21-2017, 09:47 AM   #14
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Originally Posted by 1turbofocus View Post
The Focus intake manifolds have always been good manifolds as for flow , HP and TQ
I took a cosworth knock off Duratec manifold which is well known to be a good intake for the Duratec and changed the mounting flanges so it would bolt up to the MK3 , it was one of the manifolds I tested on my Dynojet and it failed to add HP/TQ

The stock intake matches pretty good to the head and TB and I flowed the intake on my SuperFlow Flow Bench and they flow very well

All things being equal this is not a "stock" engine compared to previous year engines this is more a well built or race engine , aggressive cams , 12.2 compression , well flowing head etc etc , small things like port matching the intake wont show much if anything on these engines

Tom

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Anyone try just roughing up the inside turn of the runners? I doubt there is separation but it would be interesting to try and then put it in the bench. Again... chasing 1%. I'd imagine, if there was something with that trial, it would show up top and a bench might not see it.

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Old 12-21-2017, 09:50 AM   #15
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For ?

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Old 12-21-2017, 05:12 PM   #16
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For ?

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To see if there's any gains to be had. Why else? It's not that I'm counting on that but that's just one example of very small changes that you can make that are easy and worth a shot based on experience and training working with cylinder heads and intakes. Again, chasing 1%... because it's fun and a time killer. It also wouldn't ruin a stock intake. This is all conjecture without hands-on inspection, touch, or at minimum, some good multi angle pics.
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Old 12-21-2017, 09:03 PM   #17
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I wish you all the best

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Old 12-21-2017, 09:26 PM   #18
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If there is power gains to be had, I am very interested. Glad you guys can pave the way and test and adjust. I couldn't afford it unless there's garunteed power
To avoid confusion, I am not going to port as a service. I could share information though.
Understood. I just meant I'd rather not do the work just to experiment, but would love to learn from your success. And yes, please share any results good or bad
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Old 12-21-2017, 11:40 PM   #19
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I wish you all the best

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I'm not concerned about it. I am willing to take a look at the intake if anyone had pics. If not, no big deal.
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