Paging Dave Bamber......

[Tommy A]

Was wondering if theres any updates on the new tunnel port heads, thanks.........Tom

[jbamber]

Dave isn't a participant on any forums, so I'll update.

We have developed tunnel port intake modification prototypes for the pushrod areas.  With a viable prototype in hand, we scheduled a dyno session to run baseline tests with a stock tunnel port head/intake combination and the tunnel port intake with our prototype modifications.  Unfortunately, the tunnel port test engine had serious unrelated issues.  We are now in the process of getting a good engine to use for intake modification testing.

In parallel, we have been using a medium riser head for combustion chamber and exhaust port development which we will apply to the tunnel port heads.  We are happy with our progress.  Our medium riser head is being developed and flowed on a 4.130” bore. The flow numbers (intake and exhaust) are significantly better than a TFS tested on a 4.350” bore and all other medium riser heads that we have seen advertised data on or have on the shelf to compare.   We are in the process of building a 462 CID (428 stroker) engine to test the medium riser heads, but among other things, we are waiting for a single plane, 4V TFS intake for testing.  If anyone knows of a TFS single plane 4V intake manifold we could buy or borrow for this testing, please let me know. 

If the dyno results for the medium riser heads meet our expectations, we will make them available.

Once we have tested and are satisfied with intake manifold modifications, the exhaust port and the combustion chamber development, we will continue tunnel port head design by developing a compatible intake port.  Casting development will start after the exhaust port design is finalized.

[Tommy A]

Thank you for the update, I have a friend waiting on the Tunnel Ports...Thanks,  Tom

[Dumpling]

So, the 12th of never...

[jbamber]

So, the 12th of never...

Almost everything seems to fit in "the 12th of never" category these days - but we are doing our best to be an exception.  This program is a priority for our business, and we are spending $$ and time to make it happen.  We aren't stuck.

Both "forks" of this development are only awaiting the arrival of parts.  For items like the TFS single plane 4v manifold which seems to be a "12th of never" item, we have developed a plan "B". 

Our target for medium riser head availability is the May 2022 timeframe, and are hoping the tunnel port heads will be available only a few months later.  In this supply chain climate, it is impossible to promise timelines but we will do our best.

[Gregwill16]

Any more details on the medium rise heads, factory original, updated?

[blykins]

What's the intake port volume on the MR head?

Feel your pain on the timeline stuff.  The motorsports industry has pretty much went to pot on getting parts in a reasonable manner.

[jbamber]

Any more details on the medium rise heads, factory original, updated?

They are cast aluminum heads based upon the medium risers.  Stock medium riser manifolds fit, but port matching will be recommended on the intake manifold.  Stock rocker arm type set-up will fit – a small cup offset will be needed on intake rockers.  Stock valve covers fit as well.

The combustion chamber and both ports have been greatly improved.  We want to include the smaller bore engine market with these – as I mentioned above, the heads are optimized for a 4.130” (and larger) bore, but the valves fit with comfortable clearance on a 4.080” bore (.030” over 390) engine.

[jbamber]

What's the intake port volume on the MR head?

Port volume is a metric we don’t use – we use the cross-section area of the port instead.  The cross-sectional area of our port is very similar (maybe slightly bigger) than the TFS – so our port velocity is about the same or possibly higher than the TFS.  We like high velocity ports.

[blykins]

What's the intake port volume on the MR head?

Port volume is a metric we don’t use – we use the cross-section area of the port instead.  The cross-sectional area of our port is very similar (maybe slightly bigger) than the TFS – so our port velocity is about the same or possibly higher than the TFS.  We like high velocity ports.

I'm getting about 360 cfm @ .650-.700" from a 178cc port on the TFS head with a little vane and short turn manipulation, no change to the port opening itself. 

I'm always looking out for the next best thing as technology is always advancing, but the TFS stuff is real hard to beat right now.  Be interested in seeing what you guys come up with.

[e philpott]

Hey Brent , roughly how many CC's do the Vien take up on the TFS heads?

Sweet on the new head medium risers and TP making progress !!

[Eken1]

Any results on either of the Dyno engines yet? 

[JacksFordParts]

They are working on it