I have been talking to John at Hytech for my motor build and for my purposes he recommended 12.1-12.5 compression. I know that he is a very reputable builder and I am in no way doubting his knowledge. However, from talking to others (local engine gurus, etc.) about my build I have been told that 12.1-12.5 compression is not a good idea for a daily driver seeing 40 miles a day. At that rate it would only last 40-50k miles. John has told me that compression, built right, would last 100k miles.

Any help?

 

Trust your builder/tuner, if you do not, HE should get as far away from you as possible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmitrna &raquo;</TD></TR><TR><TD CLASS="quote">However, from talking to others (local engine gurus, etc.) about my build I have been told that 12.1-12.5 compression is not a good idea for a daily driver seeing 40 miles a day. </TD></TR></TABLE>

And whose credentials outweigh whose?

 

Longvetity depends on a lot of things, tune, fuel, driving habits, etc. I honesty can see both sides of the argement but I think your actions outwiegh almost all the other factors given you start with a comptent build and tune.

If you want 100k out of motor then buy a stock car and don't mod it and don't race it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">

And whose credentials outweigh whose?</TD></TR></TABLE> For real.

You ask one of the best known and respected names for advice then listen to a bunch of locals?

That's like skipping stock tips from warren buffet to listen to some high schooler.

A lot of things factor on engine life.

 

11.8~12.1 for the past 4 years its in the mid 12's as of now..daily driven.

 

I believe there are some factory cars (non-diesel) that have 11.5 or 12:1 CR. Local engine builders are not tuners or engineers. Their knowledge is limited to basic assembly most of the time...