Worn Piston Ring

[MaddMart]

I did a compression test on my Track Sprint this morning before & after I re-torqued the head. My tester isn't brilliant but it did show that no. 4 cylinder was down relative to the others. So I took the car down to my Bro-in-Law's garage so that he could check it properly. Sure enough, no. 1,2 & 3 cylinders were between 160 & 165 psi. Unfortunately no. 4 was only 70 psi. As there are a lot of fumes coming from the crankcase breather as well, it's a fair chance that the rings are worn.<br>
<br>
My pistons are +0.060" oversize. Anyone know where to get a set of +0.060" oversize rings from. Rimmers don't list them. SAAB 99 ?

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... omiteuk</A> at: 1/11/06 10:30 am<br></i>

[alun n]

Put some oil down the plug tube and test again. A momentary rise in compression will prove ring failure. The fact its number 4 is a bit telling too though<!--EZCODE EMOTICON START :( --><img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("><!--EZCODE EMOTICON END--> <br>
<br>
SAAB rings would be too small wouldn't they, wasn't that the 1850 bore? Try Sprintparts...

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[2F45T4U]

Ahhh but Alun your forgetting. Its a slant so the oil will sit at the bottom of the piston and not provide a full seal. <!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/images/emoticons/happy.gif ALT=":D"><!--EZCODE EMOTICON END-->

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[alun n]

That depends on how you apply it; if you have devised a pippette which sprays it in a cone it does the job as I say...momentarily.<br>
<br>
<br>
It always pays to make sure you do the job well when spraying into a ring, no matter how old or worn it is.

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[Jod Clark]

that's outrageous.

<p><!--EZCODE IMAGE START--><img src="http://www.towingandleisure.co.uk/images/bash.gif" style="border:0;"/><!--EZCODE IMAGE END--></p><i></i>

[george]

adam asked me if i'd seen the plume behind your car i hadn't but did veiw it and could see from the photo that it was more than steam as it was still lurking in the air quite heavy <br>
i suspect rather than a worn ring it's probably a broken one if i suspect the engine has obviously undergone some work prior to you using it on the track<br>
or even a piston . saab ones used a smaller bore (.4 b20..) so doubt even with oversizes a match would be posible

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[SprintV8]

If it's just for Track use you could try gapless ring set<br>
As used by most Racer's in Natonal HotRods ETC.<br>
<br>
<!--EZCODE AUTOLINK START--><a href="http://www.totalseal.com/">www.totalsea ... <!--EZCODE AUTOLINK END--><br>
<br>
<!--EZCODE AUTOLINK START--><a href="http://www.midlandperformancecentre.co. ... <!--EZCODE AUTOLINK END-->

<p>1980 Dolomite SprintV8 (Soon to be shoehorned with a 360bhp of TVR AJP V8 Pumping Alloy !)<br>
2002 Citroen Xsara 2.0 HDi Estate.... Part's delivery Vehicle.<br>
They laugh at me because I am different. I laugh at them because they are all the same!)<br>
<br>
http://www.triumphowners.com/310 </p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... printV8</A> at: 25/6/06 11:41 am<br></i>

[MaddMart]

I thought that SAAB did a 2 litre, but as George says, probably a diferent bore size. Come to think of it, I'm sure Andy (the guy I bought the car off) said they were SAAB pistons.<br>
<br>
I'm in the middle of stripping the engine down & all will be revealed next week, I expect.<br>
<br>
Gapless rings, expensive ? Couldn't see any prices.

<p>Martin<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dolomitesprint.com/" target="top">www.dolomitesprint.com</a><!--EZCODE LINK END--></p><i></i>

[SprintV8]

Advantages<br>
You get and keep all the compression without ring blow by.<br>
<br>
Disadvantage's<br>
Cost,<br>
And the bore must be perfectly round.<br>
Best on new or partly used bore's.<br>
<br>
Should of added that earlier.<br>
<br>
<br>
<br>


<p>1980 Dolomite SprintV8 (Soon to be shoehorned with a 360bhp of TVR AJP V8 Pumping Alloy !)<br>
2002 Citroen Xsara 2.0 HDi Estate.... Part's delivery Vehicle.<br>
They laugh at me because I am different. I laugh at them because they are all the same!)<br>
<br>
http://www.triumphowners.com/310 </p><i></i>

[SMIFTER]

Mart<br>
<br>
You really must be careful with your ring you know, wear it out and the fluids won't stay in your bottom end.<br>
<!--EZCODE EMOTICON START ;) --><img src=http://www.ezboard.com/images/emoticons/wink.gif ALT=";)"><!--EZCODE EMOTICON END--> <br>
<br>
Are you sure they are +0.060" ?? Worth checking they arent less if its just what you have been told by the PO.<br>
<br>
What about Sprintparts? They may be able to source a replacement in the right size.<br>
<br>
G<br>
<br>


<p><!--EZCODE LINK START--><a href="http://www.smifter1971.pwp.blueyonder.c ... >Smifter's Dolomite Sprint Website</a><!--EZCODE LINK END--><br>
<br>
Scary XE powered 1974 Dolomite Sprint Trackday Experiment. Maybe someday soon<br>
<br>
2002 Octavia VRS - 20 valves, leather, a turbo and 146mph - Czech it out!! </p><i></i>

[MaddMart]

ooer! missus!<br>
<br>
I'm 99% sure they are +0.060" but I'm going to check first (should have them out tomorrow evening all being well), I was going to ask Sprintparts when I was 100% certain.

<p>Martin<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dolomitesprint.com/" target="top">www.dolomitesprint.com</a><!--EZCODE LINK END--></p><i></i>

[slant04]

SAAB 99's are deff 1985 cc, Try parts for SAAB, always had a reasonable resonse from them on my 900. In fact, you may even find 900 Rings (non 16v) are the same. They didnt alter the capacity

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[alun n]

They may be a 2 litre, but wasn't the capacity increased from the 1850 origin by stroke rather than bore?

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[Jon Tilson]

Saab used 2 different blocks. Early cars are common with our slant 4's. I think they come in 2 litre form with the early block. If so they have the same stroke as TR7 and Sprint, which are just bored out over the 1850.<br>
The later Saabs have the different block and I dont think they have that much in common with ours.<br>
<br>
Jonners

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[MaddMart]

I got the head off tonight & after cleaning the piston crown I noted the figure 1.016 stamped on the top. Now usually you see +0.20, +0.40 etc. so I assume this is metric, which equates to 0.040". Just nod yer head if you agree. Which means I can get them from Rimmers. But the ones Rimmers sell are "county" & I've heard they aren't the best ones to get...but I don't know, so need some feedback from those of you who have bought rings in the not too distant past. <!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/images/emoticons/happy.gif ALT=":D"><!--EZCODE EMOTICON END-->

<p>Martin<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dolomitesprint.com/" target="top">www.dolomitesprint.com</a><!--EZCODE LINK END--></p><i></i>