Calling Max_Torque - manifolds and turbos question

[sl0wlane]

227bhp said:

What are 'Clockwise "turbo" cams', how do they differ from the originals and what is the spec?

EDIT - probably shouldn't publish these publicly... removed.

If you can help with something like pipe-max / simulation software or calculation please PM

Edited by sl0wlane on Monday 5th December 11:28

[sl0wlane]

Interestingly I gave all the engine, cam, desired usage, power band and turbo specs to Burns stainless (http://www.burnsstainless.com) who offer a header design service.

And they came back with a suggestion that was not a million miles away from what I was going to go with: 1.7/8 diameter primaries of a 23" length (I had worked out 24")... so I guess we will start here for the first iteration!

[sl0wlane]

Luther Blisset said:

DP in the Netherlands make turbo manifolds and they focus too much on equalised lenghts and they end up looking like a ball of spaghetti.

Wow! They certainly do! I'll take my manifold with some built in interheating lol :

[sl0wlane]

stevieturbo said:

Even at OD, unless it's very thickwall tubing ( ie to reduce the ID ), that's seriously large diameter pipe for only 500hp

I've made over 800hp on larger 4cyls with tubing smaller than that

Or is that a n/a exhaust setup they're calculating for ?

Burns designed for the turbo I have, even down to the TiAL v-band flange.

Most N/A Honda manifolds are 1.7/8" (at least the ones Ian @ clockwise specifies)... however we have actually gone for 1.3/4" with a flare to the head for the anti-reversion step with a gentle taper.... and maybe even allowed for some slip joints so we can alter the length and experiment later on.

[sl0wlane]

It's single / open "M-Spec" version of this: http://www.owendevelopments.co.uk/product/389/Owen...

[sl0wlane]

jontysafe said:

This is my custom twin scroll manifold for a YB I'm building. Severely space restricted so very short runner.

Don't over concentrate on one aspect of build, give the job to someone that knows what they are doing. I over concentrated on intercooling and it probably added 6months to build.

Nice fab work!

Don't get me started on intercoolers (already controversial in Lotus land, most opt for water-air)... I'm all hammer formed end tanks and aerospace cores already...

[sl0wlane]

Thanks, full reply when m not drinking

If you are subscriber, great webinar here, interestingly covers the points and logging requirements Max_Torque covered and a great practical example... Andre obviously loves thetwin scroll borgs too... but I'm too invested to change now (turbo was actually purchased around 18 months ago - LONG project!)

https://www.hpacademy.com/previous-webinars/107-an...

If you are going to suggest the skunk ultra manifold... sorry but I do actually prefer the one I have, bar a custom made one it's the best available off the shelf in my mind... the proof will be in the (eventual) pudding.

Thanks for the link though, kinda confirms that "as short as possible" is not the answer to Turbo exhaust manifold design doesn't it?!

Edited by sl0wlane on Friday 16th December 19:01

Edited by sl0wlane on Friday 16th December 19:37

[sl0wlane]

Thanks for the link to the speedtalk forum...

Lots of threads covering pulse tuning with turbo applications... it appears the general consensus is that it by and large works much like an NA application and can be tuned as such, threads like this : http://speedtalk.com/forum/viewtopic.php?f=15&...

[sl0wlane]

^ see above for reason why I asked Max_Torque for comment and not the PH clicky crew

Thanks again for the help Max, I'll be back with measurements as this finally turned up:

Edited by sl0wlane on Monday 19th December 19:38