LQ4 or LQ9?
05-11-2009, 06:14 PM
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LQ4 or LQ9? I’m looking for a LS motor for a project; can you guys help me get the right start? My goal is to build a powerful (450 – 500 HP NA range) reliable motor on a budget. It will be pushing a 2200 pound car that will see about a half dozen track days a year at a local road courses and the rest of the time for weekend use on the street.
The plan is to buy an iron LS, use L92 heads, a L76 intake, mild cam (hot cam?) & throw in good rod bolts and oil pump for a little added insurance. I have been considering a LQ4 due to the lower compression & plan for the L92 heads, and I didn’t want to fly cut pistons. I understand the LQ9 has better connecting rods, and am re-thinking my plan. So what is the best engine for me?
The plan is to buy an iron LS, use L92 heads, a L76 intake, mild cam (hot cam?) & throw in good rod bolts and oil pump for a little added insurance. I have been considering a LQ4 due to the lower compression & plan for the L92 heads, and I didn’t want to fly cut pistons. I understand the LQ9 has better connecting rods, and am re-thinking my plan. So what is the best engine for me?
05-11-2009, 06:42 PM
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05 and up LQ4 is just as strong as the LQ9. The L92's are 70 cc' chambers, so I'd try and find a LQ9. This will allow you fairly good compression with minimal mill. With the LQ4 you'll have to mill more thus reducing PTV.
