Re: Re: 1.7 v. 1.6 roller rockers

From: Bob Tom (tigers@bserv.com)
Date: Mon Jan 17 2000 - 12:46:55 EST


At 07:49 AM 1/17/00 -0800, you wrote:
>The 1.7/1 rockers do develop more lift but more important,
>they give you faster lift rates. If you have a cam with a
>lift figure at the cam of say .325, with 1.6 rockers, your
>valve lift is .520, with 1.7's, the valve lift will be .552.
>If you measure the duration at .250 valve lift, the increase
>in duration is about 3 degrees. With a change from 1.6 to 1.7's,
>you can expect to see an additional 10-20 HP. There doesn't
>appear to be any alignment problems caused by the 1.7's, but
>there is a variance in stud location from Dodge. I went through
>5 bare heads just to get a pair that I was happy with. Bottom
>line on any rocker install, make sure the rocker centers on
>top of the valve...... Frank

Thanks, Frank. That type of information is hard to come by
(at least, for me) and valuable to have.

So, how is your project coming along. I face a similar problem
as does Ted. Ted went the SC route. I went with the modding the
engine's internals way, making compromising decisions to keep it
emission passable.

Next big gain that I see is via SC but too expensive, especially
up here. Nitrous is attractive for the track but I'm the wrong
candidate ... chances of me forgetting to do something are high.

Thanks again.

Bob. Southern Ontario, Canada.
'97 Dakota CC Sport, FR, 5.2L, 3.55 SG, auto.



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