: I would like to get some ideas from everyone on
: what type of cam specs would work well on a
: slant 6 engine with a turbo. The engine
: would be a street driven car with a mildly
: modified 170 engine. The engine would run
: 20-25 lbs. of intercooled boost with
: electronic fuel injection. I have seen the
: 2.2 turbo Chryslers put out 500+ horsepower
: somewhat reliably with 30psi boost, so I
: feel that the 170 can take almost as much
: boost without damage.(Controlling detonation
: of course!) The compression ratio would be
: in the 8.0:1 range. Doc, do you have any
: experience in this area? Any idea how the
: 2.2L heads flow compared to slant 6 heads?
: The newest issue of High Performance Mopar
: has some flow numbers for reference. The
: spec's I'm looking for is lobe separation
: and lobe centerline and valve overlap
: especially. Thanks

: As you suspect, you do not want a bunch of
: overlap with a turbo, especially if you set
: it up to provide lots of boost at lower
: rpms.
:
: The other consideration is the "zero
: deck" of the 170, are you planning to
: notch the pistons or make some kind of dish
: or trench??
:
: The only 170 turbo I have done used a stock
: engine and a "blow through" 2.2
: turbo on a 2 bbl BBD.
: Spooled-up quick and woud rev to 6000 before
: going "flat" (not enough fuel or
: cfm?? or both?)
:
: Back to the cam, 45-55º overlap is about all
: you need and a wide lobe spacing,
: (110-112º)should work pretty good but
: realize this is just "ballpark"
: guesstamate stuff, valve clearance needs to
: be worked-out.
: DD

: Doug, I wasn't aware that 170's were zero deck,
: but if that is the case then I would have a
: custom built J&E piston to correct it then.
: I think it would be cheap insurance to
: invest in a set of these when I'm looking at
: a possible 2.5hp per Cubic inch. Back to the
: cam though, I since this will probobly be a
: custom grind, is there a duration and lift
: spec you could recommend? I am suspecting a
: duration of about 225 degrees @.050 lobe
: lift and about .520" net lift. I don't
: know if it is possible to get that much lobe
: lift with that little duration, but I can
: always check with a cam grinder to see.

: Boy, a roller cam would sure help here, much
: faster ramp rates.
: The zero deck 170 is a big issue, it has always
: kept the lifts low on the performance
: Hyper-Pak cams. (the factory Hyper-Pak cam
: was only .440 lift)
: I would say we need to mock this up and take
: some actual measurments, using what ever we
: have around, that would give us a base line
: to work from. Do you have a "big
: lift" cam and a 170 around?
: DD