Morrison Dog Bone Throttle Body

[LGAFF]

Did anyone see this on Marc Haibecks Website?

http://zr1specialist.com/HAT%20Web/facts%20and%20failures/DCP_1509.JPG

We encountered this legendary throttle body on the Morrison Number 94 endurance racing car. We were preparing the car for the 2014 vintage racing season.

As the name so aptly describes, the section between the OE throttle plates has been removed and a one piece throttle plate has been installed.

[LGAFF]

Will be curious to see if my air horn mod nets any HP.....


*AC Bump removed completely
*Alt hump reduced
*Center gap for airhorn screw reduced and welded in to reduce turbulence

http://i134.photobucket.com/albums/q115/lgaff/DSCN5715.jpg (http://s134.photobucket.com/user/lgaff/media/DSCN5715.jpg.html)
http://i134.photobucket.com/albums/q115/lgaff/DSCN5717.jpg (http://s134.photobucket.com/user/lgaff/media/DSCN5717.jpg.html)

[XfireZ51]

My guess is that it won't. As you know, I have 63mm TB on my 5.7. A restriction in the airflow will show up as a drop in MAP at WOT as RPM goes up. With the dyno runs I have done, I don't see that happening, not only w stock air horn, but with air bridge and cleaner assembly attached.

[LGAFF]

What is the MAP Reading at WOT?

[LGAFF]

Mercruiser(Scott Skinner) found the Air Horn to be a restriction in actual testing; Marc seemed to think the same. We will see

[XfireZ51]

What is the MAP Reading at WOT?

99.6+kPa. Was MercCruiser using a 63mm TB?

[LGAFF]

I would have to go back and ask, they did progressive testing on an engine starting minor mods and documenting each change and variance. I was surprised when he mentioned cleaning up the airhorn was worth about 5hp.

[Bob Eyres]

That dog bone is cool. And this was made for a stock displacement ZR-1?
Are the openings enlarged also, or stock diameter?
It would be interesting, (and not too difficult), to dyno that in comparison to a stocker, and one that was overbored.

Does Marc have a theory as to what the ideal cfm a, (350c.i. LT5), throttle body should pass? Hey Marc ! :wave:

[LGAFF]

Brett Henderson might know about this too.....

[Blue Flame Restorations]

The 94 SankeSkinner is not cammed. It may or may not be ported. It sounds stock and Robert stated that it didn't feel modded.

[Blue Flame Restorations]

The 94 SankeSkinner is not cammed. It may or may not be ported. It sounds stock and Robert stated that it didn't feel modded.

[LGAFF]

I wonder why it has the AC still in it..so this is not the Snakeskinner race car>

[Blue Flame Restorations]

I wonder why it has the AC still in it..so this is not the Snakeskinner race car>

Lee, I didn't reference the pic but the 94 race car definitely has no AC.

[LGAFF]

Might be a delete pulley