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Engine Restorer?

Old 08-03-2015, 01:01 PM
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UK Engine Restorer?

Anyone had any experience with engine resore liquid for oil that brings engine back to peak performance and pro and cons?
My engine is at 33k and showing compression 680.
My dad has purchased some engine restore fluid and want to put it in my oil.. yes no?

Last edited by RoddyMac; 08-15-2015 at 08:29 AM.
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Old 08-03-2015, 01:13 PM
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Waste of time and money. A loss of compression is mechanical, no liquid is going to fix it, it needs a rebuild.
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Old 08-03-2015, 01:22 PM
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correct, if compression is low the only way to fix it is a rebuild. There is no magic potion or fluid that will correct the problem.
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Old 08-03-2015, 01:33 PM
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Ok so my compression seems ok at the moment yes?

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Old 08-03-2015, 02:01 PM
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Keep in mind that anything you put n your oil gets injected into your combustion chambers ... unless you have a Sohn adaptor.
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Old 08-03-2015, 02:02 PM
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No, 680kpa is the FAILING line. You don't have a single rotor face that passes.

The handwritten note of "What I would expect" doesn't mean "this is ok", it means "I expect engines to be failing at this mileage".
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Old 08-03-2015, 06:01 PM
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Now Im confused, spoke to Mazda technician who says these engines will run as low as 300 kpa. Spoke to another RX 8 modding outfit near London and they said they would be happy with these results and that they would also qualify to race the RX8? so is something different overseas?
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Old 08-03-2015, 06:09 PM
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two different things going on here.
1. will a rotary engine still "run" as low as 300kpa? Yeah, probably.

2. is the engine's compression below the acceptable number that Mazda deems for a motor? yes.
as RIWWP pointed out, every rotor face is below the minimum.


in short: the engine is on it's way out and needs to be rebuilt or replaced.
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Old 08-03-2015, 06:21 PM
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Yes, the engine has failed the test to determine if the engine is healthy.

Does that mean it won't run? No. It will run. But even with it running, it HAS failed. It is well below spec.

Look up the compression test for any piston engine, there is a spec that "fails" the engine if it is below that spec. Same thing here. Doesn't have anything to do with whether or not the engine runs. Did it pass the test? No. Did it fail the test? Yes.

Anyone that tells you that these numbers are fine are either unaware of how good they can be and should be, or they are trying to get out of doing any work for you.
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Old 08-03-2015, 07:30 PM
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This engine will NOT run at 300 kPa, the apex seal will fall out before that, this is not Rx7(which I've seen 1 that runs at 3xx kPa), but even it does it runs like ****, the owner is about to get a rebuild.

at around 650 kPa, the engine compression will fall fast. so it might be better for u to get a rebuild soon before it compeletely fails.
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Old 08-04-2015, 07:48 AM
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Thanks for the advice guys, just had a chat with rotary revs who have advised a good run and re compression test, noticed the revs were not at 250 rpm as needed for proper compression test, hence advice to get re done after a good run and Me running it for a year as opposed to compression test when i bought it. Ill let you know the results and if still same will have to consider rebuild 8(.
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Old 08-04-2015, 09:05 AM
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Why waste your money on another compression test? Those few RPM ain't gonna make a difference. Just bite the bullet and admit to yourself that the engine in your 8 is on its last legs and needs rebuilt.
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Old 08-04-2015, 01:34 PM
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I would do but the guys at MX5 Rx8 Garage have said if the revs were as low as 235 instead of 250 for the test then compression readings would be significantly lower, they also stated that if the car seems like its running well with no issues (as it is) and only at 33k miles on the clock, they suspect incorrect readings. Paying 50 and getting a good result is better than paying 2000 when may be an engine rebuild is not needed? for 50 worth a try. If it comes back still needing a rebuild I wont be kicking myself later or wondering 8).
btw colon, is yours on same engine as 85k?
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Old 08-04-2015, 01:40 PM
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Good luck Roddy, let us know how it goes.
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Old 08-04-2015, 01:48 PM
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Its the wifeys birfday today so we popped into the country for a spin in the 8 and a meal, i disabled traction control and find steering alot more stable at higher speeds, with traction on it jumps all over the place lol but we do have really bumpy roads round Lincoln UK.

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Old 08-04-2015, 01:55 PM
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The RPM value matters, because it is needed for normalization of the result. Having a different starter speed won't change the engine's actual compression, just the raw scores, which should always be normalized to 250rpm, regardless of if the test was done at 200rpm or 300rpm, or anywhere in between.
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Old 08-04-2015, 02:04 PM
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now expecting bad news 8(
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Old 08-04-2015, 02:05 PM
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Originally Posted by RoddyMac View Post
I would do but the guys at MX5 Rx8 Garage have said if the revs were as low as 235 instead of 250 for the test then compression readings would be significantly lower, they also stated that if the car seems like its running well with no issues (as it is) and only at 33k miles on the clock, they suspect incorrect readings. Paying 50 and getting a good result is better than paying 2000 when may be an engine rebuild is not needed? for 50 worth a try. If it comes back still needing a rebuild I wont be kicking myself later or wondering 8).
btw colon, is yours on same engine as 85k?
Yes, it's still the original engine and still going strong. Last compression test at 80K showed the lowest rotor face at 113 Psi. She's got a lot of life left in 'er. Regular maintenance since new. Changed oil and filter after the first 1000 miles and have been using 10W30 synthetic since then at every 2500 miles. Have been following the RX8club.com maintenance recommendations since they were first published on this forum. She's absolutely stock except for a BHR resonated midpipe. She's in pristine condition inside and out.
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Old 08-04-2015, 02:14 PM
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Very nice and good to hear, Im looking after mine well too but I think you cant change the condition you bought it in 8(. After its initial mazda health check, put new gators on it , replaced damaged roll bar link, headlight suspension arm, new cat (cat full of debri and muck) new coil, plugs and replaced back tyres low tread. That was 1 year ago, it went in for MOT last week and sailed through with 1 minor advisory to keep an eye on tread on front tyres starting to get low.
I use semi synthetic 5w30 and keep her topped up constantly, i open her up to 6/7k revs every journey to keep crap flushed out the engine and to be honest in a year never had 1 issue apart from in the first month I over reved as I let out the clutch and got burning smell, engine warn light appeared but then went off, so think it was a temp sensor, that was like 11 months ago nothing bad since.


Last edited by RoddyMac; 08-04-2015 at 02:23 PM.
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Old 08-04-2015, 02:35 PM
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got a pic col?
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Old 08-04-2015, 03:16 PM
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You gonna eat that?
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Here's my '04 LY GT, fwiw.
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Old 08-05-2015, 03:56 AM
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Thats a kewl 8 Braa..


Last edited by RoddyMac; 08-05-2015 at 04:03 AM.
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Old 08-05-2015, 11:25 AM
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tremendous looking 8s mates! right on, yellow looks so good
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Old 08-05-2015, 04:21 PM
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Originally Posted by arexatemate View Post
tremendous looking 8s mates! right on, yellow looks so good
Thanks.
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