Are the flame grooves only for na engines? It seems like the higher
combustion pressures you get with boost you try for as smooth a combustion
chamber as you can get to reduce detonation...
MikeMeyerhoff
1992 Dakota V6 CC
1988 ConquestTSI (200hp/246ft-lb @wheels)
>
> Hello folks! I just joined the list. I am Greg Cooper in Huntsville,
> Alabama. I have been doing Turbo Dodges since the mid-eighties. I am
> active in several Shelby-Dodge related lists as well.
>
> I am an ex-Chrysler engineer and was the Manager of the Mopar Tech Hotline
> for several years.
>
> I just bought a really straight '95 Dakota Sport. I purchased it from a
> local junkyard for $800. It was in need of an engine overhaul and some
> cleaning. It has the AX-15 five speed and the good 'ole 2.5 common block
> motor. This was part of the draw for me because I have built several dozen
> of these little engines over the years, albeit turbos.
>
> After several weeks of tinkering and an engine job, I have almost everything
> on the truck functioning as well as or better than new.
>
> I have a friend that is an aerospace machinist and he helped me out with
> some mods. I first enlarged the stock TBI unit to 50mm from the paltry 43mm
> bore (27% increase in area). A 35mm phenolic spacer was installed under the
> throttle body. A Wolverine Blue Racer Torque cam was installed, as well as
> header wrap on the exhaust manifold. The head and intake were enlarged and
> dimple ported (like a golf ball), the compression was increased a full
> point, flame propagation grooves were cut into the combustion chambers,
> colder plugs installed, base timing increased 4 degrees, and cylinder bores
> were increased .040 (adding 60cc's displacement). My friend is in the
> process of turning an underdrive pulley for me right now for a %25 reduction
> in accessory speeds.
>
> Having said all that, I can honestly say that the little engine runs quit
> well. I never expected a powerhouse. If I had that in mind I would have
> gone with a turbocharger and maybe a sixteen valve head.
>
> The speedometer has me completely perplexed, however. I have swapped three
> separate speed sensors, checked all the wiring for continuity and
> resistance, checked the voltages to the sensor and changed the instrument
> cluster. The speedometer didn't work when I first bought the truck. I
> swapped the speed sensor and it worked. I then did the engine rebuild and
> now have very intermittent speedometer function. It sometimes works when
> cold an almost never works any other time. I am stumped by this
> speedometer. Is there anyone out there with experience in dealing with a
> similar situation?
>
>
> Greg K. Cooper
> Huntsville, Alabama
>
> 1983 Dodge Rampage (restoration project)
> 1986 Shelby Charger Super 60
> 1987 Shelby Daytona
> 1989 Plymouth Acclaim Turbo II
> 1992 Dodge Daytona IROC R/T
> 1995 Dodge Dakota Sport
> 1998 Chrysler Concorde LX
>
>
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