RX8 08 Series 1 Compression test

Any type of technical questions or info

Moderators: KillerRx4, orx626

Post Reply
Message
Author
sross555
Registered Rotor User
Posts: 5
Joined: Fri Jun 08, 2018 1:57 pm
Has liked: 1 time
Been liked: 0

RX8 08 Series 1 Compression test

#1 Post by sross555 » Tue Jun 12, 2018 2:08 pm

Hi,

I was wondering if someone could help me with these compression test numbers.

The car the test was done on is an RX8 2008 Series 1, the test was done at 55,000 K's, the car now has 67,000 K's i am looking at buying this car and need help translating the compression test numbers and what they ultimately mean.

Thanks, any help is much appreciated.
Attachments
Capture.JPG



User avatar
KYPREO
Administrator
Posts: 15229
Joined: Tue Jul 09, 2002 6:09 am
Location: Melbourne
Has liked: 106 times
Been liked: 64 times
Contact:

Re: RX8 08 Series 1 Compression test

#2 Post by KYPREO » Tue Jun 12, 2018 2:40 pm

730, 730, 720kpa = 106, 106, 104psi
750, 740, 750kpa = 109, 107, 109psi
720, 730, 720kpa = 104, 106, 104psi

Whether or not they are good numbers is a matter of opinion and how much you expect to get out of the engine. They are well within Mazda's specs, but indicates an engine that has experienced some wear. Check out this post from rx8club.com, which suggests these numbers should attract some caution, but keep in mind that is just one person's opinion: https://www.rx8club.com/new-member-foru ... ost4533734 For me that opinion and the chart is pretty pessimistic - if it lasts 40,000km that might be perfectly fine in your mind. Depends on how many km's you plan on driving and the price.

Like mazrx5 said in the other thread, all these engines will eventually require a rebuild. So factor in the potential of that accordingly. It's the same as looking at buying import FDs.
These users liked KYPREO's post:
sross555 (Tue Jun 12, 2018 2:50 pm)


My Build Log
WTB series 3 RX-7 shifter boot in off black/grey

sross555
Registered Rotor User
Posts: 5
Joined: Fri Jun 08, 2018 1:57 pm
Has liked: 1 time
Been liked: 0

Re: RX8 08 Series 1 Compression test

#3 Post by sross555 » Tue Jun 12, 2018 2:54 pm

Thanks heaps for the reply, the price is $12,000.

Its driving me mad trying to find one, obviously i want the best i can get for the coin i want to spend which is $15,000, but i still havent found one that ticks all the boxes.

Will keep looking i think.



rx3sum
Get a Life
Posts: 3741
Joined: Thu Nov 21, 2002 2:45 am
Location: WA
Has liked: 1 time
Been liked: 0

Re: RX8 08 Series 1 Compression test

#4 Post by rx3sum » Tue Jun 12, 2018 5:50 pm

With a 15k budget you should be able to get a nice one with a stuffed engine and then get engine rebuilt.



User avatar
S2 13BT
Moderator
Posts: 5818
Joined: Mon Jun 24, 2002 10:26 pm
Location: Canberra
Has liked: 0
Been liked: 0

Re: RX8 08 Series 1 Compression test

#5 Post by S2 13BT » Tue Jun 12, 2018 6:49 pm

Consider a series 2 if the cash extends that far. The oil injection system is improved, so they should last much longer between rebuilds. In theory.

An average RX8 engine rebuild will cost approx $9k, from calling a couple places. Pretty sure most shops will demand two new housings, plus whatever else is needed.

I'm in the midst of rebuilding a series 1 RX8 engine at the moment and even without paying a shop it's expensive. The parts cost adds up quick. It didn't look good inside (around 170000 on the chassis, but I assume it had been rebuilt at least once before or was a remanufacture or something, no way the original engine went that far). By the way my RX8 was about $3k with a known dead engine, and the car was is good condition, not great, but pretty good. If you get lucky and can something that is known dead for about $5k in great condition, just needing a rebuild that'd be perfect.


FC track car in the build.
@ Wakefield Park, Winter '08... Umm, make that Winter '09!! :( Maybe, Winter '11!!! Seriously now... Winter 2015! One of these days.

RX-8 - Budget track day hack.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post