H4Inf

A friend and I are thinking about buying a 12AT FB.. I have experience with a 13B but I'm just wondering if these figures add up for the 12AT.

This is what I've attained from the owner:
-It's a S3 1984 RX-7
-All sides of each rotor read an even ~80psi each on compression test.
-It has a Haltech F9 ECU apparently well tuned
-Dynoed at 105 rwkw / 141 rwhp (running 10psi)
-Needs a few cranks on cold start to get going
-On hot start it doesnt idle well - need to drive it straight away

Im guessing compression could read a little low if the starter is not cranking over at the ideal speed...

I'm just wondering what you guys think of it from these symptoms!

Cheers,

Paul.

mortenf

Those figures look kinda weak in my opinion.. It has a well tuned Haltech, and boosting 10 psi? That should give it more than 141 rwhp. Its just marginally more than what mine is producing on just 6 psi, and thats with the original ECU and porting. 80 psi compression does not sound that great either, especially if the car is hard to start when its cold. This could very well be a telltale sign that the apex´s are starting to get worn.

Just my two cents.

H4Inf

Thats kinda what i was leaning towards oh well, no money spent yet! Cheers for the advice

Maguire

iTrader: (1)

if its using the stock turbo, i would say thats not too bad.. thats probably around 170ish crank hp... From what i understand the stock 12a turbo is tiny. so 10psi wouldnt yield too much of a gain. It was only 132hp at the crank stock.

thekyl

80psi on compression is not that hot either. My friends RX we just finished building pushes 105-110 on all faces both sides. Might be something to consider. sounds like a solid engine just probably needs a rebuild. specially sence you didnt put how many miles are on it and how hard the previous owner drove it. But still might be worth it to pick up rebuild and resell if your getting it for a good enough price.

inuissus_cendi

the turbo motors do have lower compression rotors though, so you shouldn't expect it to get the same numbers as an N/A 12a. just something to remember

H4Inf

apparently compressions tests should not be different between na and decomp motors.. so it looks like NO SALE hehe

no money spent, so no worries, cheers for all the input!

jasrx

it deppends how much was it forsale.? as other have said it might be worth buying it and rebuilding the engine [ deppends on how cheap the car is ]

H4Inf

he was asking something like AUD$7500. NO SALE