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Old 11-12-2009, 05:08 PM   #1 (permalink)
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Default 90 sidekick engine rebuild

I am driving a 1992 Asuna Sunrunner, Canadian version of tracker. I recently came across a 90 sidekick engine for $50. This engine does turn over and ran before previous owner trashed the sidekick. Since I have the winter to play I plan on overhauling the engine, and was looking for any and all ideas as to rebuild mods. Anything from, boring, to new camshaft, pistons anything thet will help increase the HP. This more of a fun project, but if it works I still want the sunrunner as an everyday driver that can provide excitment off road and get me to the isolated fishing holes. I may look at turbos and such but rather get the incresed HP from the mechanical advantage of the overhaul. I don't want to cause a gas milage problem that will leave me stuck at the fishing hole, and since the gas tank is small, it will be of some concern. This is the first step in my new project. But all improvements will have to be street legal so I can get it from home to the off road. I will gladly listen too any and all tips, then decide what the best course of action is. Thanks for reading and in advance for any tips.
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Old 11-12-2009, 05:40 PM   #2 (permalink)
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have pro shop do the block.
exchance the head for mere $300

done.
besides obvious, tuneup , belts hoses ,gaskets, , kinda obvious.

let the pro buy the pistons based on his measurements.
(machine shop)
he will then measure the pistons and bore it to YOUR actual new pistons size.
the results will be nothing less then perfection.

he will send out the crank, or exchange it for $250

doing less is a waste,
for less id run a pig in a poke motor.
IMHO, YMMV
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Old 11-15-2009, 04:54 PM   #3 (permalink)
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will the oversized piston give much of a HP gain.
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Old 11-15-2009, 05:17 PM   #4 (permalink)
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I doubt it.
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Old 11-15-2009, 06:45 PM   #5 (permalink)
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calc the increased displacement?
then multiply this increase by a rule of thumb of, 1 hp per cu. inch . short answer.

as you see , those 0.5mm over size rings and piston are really nothing.
see that scale there.?


Long answer:
displacement is Pi times Radius Squared, times stroke (equation out of school book for cylinder. )
so calc. the before and after displacement?, then subtract the, 2 products.
then multiply this fraction times 1. (1hp per cu. in)
then times 4 (4 cyl)
behold, not squat.

i did that not only to answer your question but to show others on how to calc. displacment easy.
Askikng about compression ratio,? that gets slightly more difficult.

finding free power is hard. (no such thing as free)
all sig increases come at huge expense. "even simple NOS"

one can find a few HP by cheating the smog devices and forcing car to slightly richer. "EFIE"
Cat back exh . maybe 1hp? (or can backfire (no pun) and actually reduce HP.)
ask why.?

the best question ever asked is,
I have $1000 what can i do.?
I have $3000 what can i do./
Speed and power cost and only you know the purse.

tis a fact.

If you don't care about smog, or other issues.
you can put in a cam. and pray the ECU dont go crazy off its rocker.
if you put to much cam in, it and the plenum vacuum will flutter at idle and the ECU will hate that and mix the wrong fuel.

as Jeff Hartman said (in both new books)
Quote:
first you must learn to fool the ECU
,!
if you dont have time or the money or LUCK to do that, then switch to a custom ecu
and then there are NO RULES. (other than physics and your imagination)

hope that helps.

Last edited by kick_fix; 11-15-2009 at 06:51 PM.
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