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Upside down valve springs.
Posted: 12 May 2010 20:23
by Bobbieslandy
I thought i'd post a pic of my head after i fitted the springs upside down. only valve springs 1 and 5 are the right way up and i I wouldn't want anyone to get it wrong!
Rob.
Posted: 12 May 2010 23:27
by Hasbeen
Rob, apart from aesthetics, the up side down springs won't really
matter, if you don't rev the thing hard.
The main reason for the variable wound spring, in valve springs is
to reduce the weight of the reciprocating part of the valve spring
This allows a slightly lighter spring to be used.
The upside down spring will start to valve bounce at a slightly
lower RPM, due to the greater weight bouncing up & down, as the
valves open & close. So it really doesn't matter, if like me, you
rarely go over 4,500 RPM.
Hasbeen
Posted: 13 May 2010 07:11
by Bobbieslandy
That's my thoughts exactly, nice to get it right though.
Posted: 13 May 2010 19:17
by Beans
And with a Sprint of course you'll have to rev the nuts out of it [:D]
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<font color="blue"><i>1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)</font id="blue">
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Posted: 13 May 2010 21:42
by Marko
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Hasbeen</i>
The main reason for the variable wound spring, in valve springs is
to reduce the weight of the reciprocating part of the valve spring
This allows a slightly lighter spring to be used.
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
+1
Posted: 14 May 2010 01:03
by FI Spyder
It would bug me to no end even if I didn't ever reach 4,000 rpm. How hard can it be to reverse them?
TR7 Spider - 1978 Spifire - 1976 Spitfire - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra
Posted: 14 May 2010 10:13
by Marko
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by FI Spyder</i>
It would bug me to no end even if I didn't ever reach 4,000 rpm. How hard can it be to reverse them?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
well , you can remove them in couple of seconds with a proper size socket ,
putting them back on take a valve compressor
Posted: 14 May 2010 16:23
by Bobbieslandy
<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">It would bug me to no end even if I didn't ever reach 4,000 rpm. How hard can it be to reverse them?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
yup, no more than a minute i guess provided the cam and rocker assembly is off. It can take a lot longer if the collets decide to jump off somewhere! i'm the same though, imagine getting it dyno'd and getting 139.9999999bhp, I'd be thinking it was that damn valve spring (even if the valve spring had nothing to do with it).
I took this pic of my new valve springs showing them the right way up. i locked up the garage and sat down thinking that was one job i wouldn't have to do for a while when i noticed in the picture number 4 inlet valve spring was upside down. It was if the bugger was laughing at me so it didn't stay that way for long!
