And the compression results are in...

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Jeags
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And the compression results are in...

Post by Jeags »

... Rotor 1 - 300rpm 5.1-5.25.3 250 rpm 4.4-4.5-4.5
... Rotor 2 - Comprssion too low to be registered.

Spoke to Dwayne about this, as he put it "it's one of the best condition 8's he's seen in a while, but the worst compression as well!". He's advised me not to premix or red line the car, said just to keep it mid range (3k in a 30) and hopefully carbon will clear. He reckons it is carbon build up as the last owner has probably never red lined it and it isn't even that high mileage (48k). I'll take his advice and hopefully it will slowly improve. Will go for another test after 6 months or so if the car still runs! Any more advice? Not the outcome I wanted but at least I know where I am with it!
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Re: And the compression results are in...

Post by Nickp47 »

I’m confused, won’t keeping the revs low cause more carbon buildup?
Hate to be negative but the engine sounds beyond the point of being saved by a regular Italian tune up, hopefully I will be proven wrong though.
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Re: And the compression results are in...

Post by Jeags »

What I thought. But he thinks that redlining it would do more harm than good. It will need a rebuild, but he said hopefully if it doesn't die before then, he can clean most of it up and replace seals which should fix it! I wasn't too sure about it but I'm in no position to go against his word.
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Re: And the compression results are in...

Post by MARKTHOMASBRAND »

Who's Dwayne :?:
Mark's : 2023 Misano Blue BMW M135i XDrive.

Mandy's : 2019 30th Anniversary Mazda MX-5 RF # 1761/3000.
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Re: And the compression results are in...

Post by Nickp47 »

Ok I see so more of a temporary solution than an attempt at a fix :thumright:
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Re: And the compression results are in...

Post by Nickp47 »

MARKTHOMASBRAND wrote:
Fri Nov 01, 2019 4:31 pm
Who's Dwayne :?:
59E249F6-315B-40B3-9F3D-6D2C22B68DF9.jpeg
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Re: And the compression results are in...

Post by Jeags »

:lol: He's a fella at a local rotary specialist (Silver Fern). Nice chap!
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Re: And the compression results are in...

Post by New Duke »

Please shop around before agreeing to have him do your rebuild. I hope 'clean most of it up and replace the seals' weren't his words. Call RRP when you're ready to rebuild, or bigpete may even be able to fit a working second hand engine for you quickly.

Sorry you got those results. Hopefully once it's sorted you'll finally get to experience the engine at full power.

@Mark and Nick, he's at Silver Fern Performance.
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Re: And the compression results are in...

Post by MARKTHOMASBRAND »

Jeags wrote:
Fri Nov 01, 2019 4:38 pm
:lol: He's a fella at a local rotary specialist (Silver Fern). Nice chap!
I remember seeing something posted about "Silver Fern" on here many moons ago & it was pretty controversial :p
Mark's : 2023 Misano Blue BMW M135i XDrive.

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Re: And the compression results are in...

Post by Ryan Rotary Performance »

Dont want to say any ill words but,

Its VERY inlikely to improve by any significant amount if at all! Not sure about the advice but my advice is to get it rebuilt either by him or another specialist.

Hopefully at the moment the plates and housings are all in good condition being such a low mileage car you'll get a much better (and cheaper) engine if you just do it now.

Thats my advice
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Re: And the compression results are in...

Post by Jeags »

Nickp47 wrote:
Fri Nov 01, 2019 4:32 pm
Ok I see so more of a temporary solution than an attempt at a fix :thumright:
Aye, being an apprentice money definitely isn't that good (would take me a considerable amount of months to save enough for a worst case scenario rebuild). Definitely will rebuild this though, love it to bits! Maybe have to see about getting a credit card... :shock: #-o
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Re: And the compression results are in...

Post by Jeags »

Ryan Rotary Performance wrote:
Fri Nov 01, 2019 4:44 pm
Dont want to say any ill words but,

Its VERY inlikely to improve by any significant amount if at all! Not sure about the advice but my advice is to get it rebuilt either by him or another specialist.

Hopefully at the moment the plates and housings are all in good condition being such a low mileage car you'll get a much better (and cheaper) engine if you just do it now.

Thats my advice
Right, well it would take me a while to save up anyway so I guess no harm it trying his idea? I'm not expecting a miracle, just hopefully enough for the engine to survive while I save up!
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Re: And the compression results are in...

Post by warpc0il »

With those results I'd be wondering if the rear stationary bearing has failed and the tail of the eccentric shaft is wobbling around, either that or there's a big score in one of rear iron surfaces.

Actually, the last time someone reported numbers like that it was finally tracked down to a broken spark plug, but then he did also have "a strange metallic clicking" which everyone was sure was the bearing, though it was the air escaping through the plug body. #-o
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Re: And the compression results are in...

Post by Ryan Rotary Performance »

I'd drive it as little as possible until you save up TBH. At this point you're probably doing more harm than good.
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Re: And the compression results are in...

Post by Jeags »

warpc0il wrote:
Fri Nov 01, 2019 4:49 pm
With those results I'd be wondering if the rear stationary bearing has failed and the tail of the eccentric shaft is wobbling around, either that or there's a big score in one of rear iron surfaces.

Actually, the last time someone reported numbers like that it was finally tracked down to a broken spark plug, but then he did also have "a strange metallic clicking" which everyone was sure was the bearing, though it was the air escaping through the plug body. #-o
I wish it was that, he checked the plugs and said they were good. I haven't a clue tbh. I guess time will tell.
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Re: And the compression results are in...

Post by 30405 »

New Duke wrote:Please shop around before agreeing to have him do your rebuild. I hope 'clean most of it up and replace the seals' weren't his words. Call RRP when you're ready to rebuild, or bigpete may even be able to fit a working second hand engine for you quickly.

Sorry you got those results. Hopefully once it's sorted you'll finally get to experience the engine at full power.

@Mark and Nick, he's at Silver Fern Performance.
Keep an eye out and if you get lucky a cheap engine that runs may come up. I was luck (with help from here) and bagged one for 300. Run that while saving to get yours rebuilt.
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Re: And the compression results are in...

Post by Jeags »

Vj4sothername wrote:
Fri Nov 01, 2019 5:16 pm
New Duke wrote:Please shop around before agreeing to have him do your rebuild. I hope 'clean most of it up and replace the seals' weren't his words. Call RRP when you're ready to rebuild, or bigpete may even be able to fit a working second hand engine for you quickly.

Sorry you got those results. Hopefully once it's sorted you'll finally get to experience the engine at full power.

@Mark and Nick, he's at Silver Fern Performance.
Keep an eye out and if you get lucky a cheap engine that runs may come up. I was luck (with help from here) and bagged one for 300. Run that while saving to get yours rebuilt.
Nice idea. I'll keep an eye out, cheers.
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Re: And the compression results are in...

Post by 30405 »

Jeags wrote:
Vj4sothername wrote:
Fri Nov 01, 2019 5:16 pm
New Duke wrote:Please shop around before agreeing to have him do your rebuild. I hope 'clean most of it up and replace the seals' weren't his words. Call RRP when you're ready to rebuild, or bigpete may even be able to fit a working second hand engine for you quickly.

Sorry you got those results. Hopefully once it's sorted you'll finally get to experience the engine at full power.

@Mark and Nick, he's at Silver Fern Performance.
Keep an eye out and if you get lucky a cheap engine that runs may come up. I was luck (with help from here) and bagged one for 300. Run that while saving to get yours rebuilt.
Nice idea. I'll keep an eye out, cheers.
Mine was found on the rx8 classifieds UK Facebook page. It came out of a running car for an engine swap. He did have a second engine for the same price.

Swapping isn't massively hard if you have everything. Namely a crane (you can rent one). I did mine 95% on my own (the Mrs helped with crane control while I lined everything up). Took me 4 days to get out and in. That's on my driveway with 2 stands and a lot of faffing. My knowledge of this was online guides, changing brake pads and discs experience and a butt load of enthusiasm.

I think in a proper garage I could do it in 2 days maybe 1 long day (18hours). I'd expect a pro could do it in less still.

I'll egg on everyone in to do it themselves as I found it very rewarding. But it could give you a rough idea of getting an experts cost £x X 18 hours = £etc

If there's enough work near by Luke maybe willing to travel up.
Last edited by 30405 on Fri Nov 01, 2019 5:35 pm, edited 1 time in total.
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Re: And the compression results are in...

Post by njkmr »

Vj4sothername wrote:
Fri Nov 01, 2019 5:16 pm
New Duke wrote:Please shop around before agreeing to have him do your rebuild. I hope 'clean most of it up and replace the seals' weren't his words. Call RRP when you're ready to rebuild, or bigpete may even be able to fit a working second hand engine for you quickly.

Sorry you got those results. Hopefully once it's sorted you'll finally get to experience the engine at full power.

@Mark and Nick, he's at Silver Fern Performance.
Keep an eye out and if you get lucky a cheap engine that runs may come up. I was luck (with help from here) and bagged one for 300. Run that while saving to get yours rebuilt.

Great advice.
Don't destroy what may be a fairly good set of engine parts now.
Get a cheap temporary replacement to ride around with whilst saving up. :thumright:
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Re: And the compression results are in...

Post by Jeags »

So just to be clear, you're suggesting I could find an engine that runs, swap it out for my poorly one and get that poorly one rebuilt and then swap it back in? If so, it's definitely a possibility, I guess i'd sell the engine I bought to run around after my old one was fixed?
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Re: And the compression results are in...

Post by 30405 »


Jeags wrote:So just to be clear, you're suggesting I could find an engine that runs, swap it out for my poorly one and get that poorly one rebuilt and then swap it back in? If so, it's definitely a possibility, I guess i'd sell the engine I bought to run around after my old one was fixed?
Well it's up to you. I've kept my dead one as a project to rebuild. If the replacement one is good you can just run that and sell the old one for parts.
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Re: And the compression results are in...

Post by goodeggbob »

Hi there,i ,along with john,have had good luck with buying engines. as said before,contact big pete and see if he can help. in my opinion,there is nothing wrong with having a reserve engine,especially if you are keeping the car for a while. also ,i have a ramp here that you are welcome to use,and not that far from you,see my other thread about ramp meet,rob.
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Rob :thumright:
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Re: And the compression results are in...

Post by 30405 »

goodeggbob wrote:Hi there,i ,along with john,have had good luck with buying engines. as said before,contact big pete and see if he can help. in my opinion,there is nothing wrong with having a reserve engine,especially if you are keeping the car for a while. also ,i have a ramp here that you are welcome to use,and not that far from you,see my other thread about ramp meet,rob.
10/10 recommend Robs ramp. Robs ace too! Pete's a great guy with a large selection of parts and put up with my nonsense. 10/10 would order again.
Last edited by 30405 on Fri Nov 01, 2019 6:17 pm, edited 1 time in total.
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Re: And the compression results are in...

Post by Jeags »

Cheers for all your help guys, will start investigating options now!
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Re: And the compression results are in...

Post by 30405 »

Jeags wrote:Cheers for all your help guys, will start investigating options now!
Any questions drop me a pm.

If it was to all work out time wise I could be tempted with another trip to robs.
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