R10, R10S Valve sizes ??
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Thread: R10, R10S Valve sizes ??

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    Fellow Frogger! R8philSA's Avatar
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    Default R10, R10S Valve sizes ??

    One for the tech experts.

    Can anybody tell me, is there a difference in the diameter of the R10 and R10S Inlet and Exhaust valves ?

    Also, is the R10 camshaft grind different to the R10S camshaft grind ?

    Just doing some research.

    Thanks for your help

    Cheers Phil

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    Too many posts! JohnW's Avatar
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    I'll wait for Simon on that one Phil.
    JohnW

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    1000+ Posts J-man's Avatar
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    I've got a 10S engine back in my possession now, so I'd be interested to know too Simon .
    cheers,

    John

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    I thought the 10 and 10S were identical except for the carby, manifold maybe? the dash and the stripe. They certainly didn't seem to go any faster than a bog standard well run in 10. I may be wrong......
    Last edited by Kim Luck; 5th July 2014 at 11:46 AM. Reason: forgot the manifold

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    1000+ Posts renault8&10's Avatar
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    The cams were different I know that. I think the valves were different, but can't be sure. Of course the carbies and manifold were different. I have a vague recollection that the gear ratios might be slightly different also, otherwise they are pretty much the same. It is different head from memory, as it goes back to the 8 ports rather than the siamesed type ports.

    Ironically, I got an email yesterday or so from someone with a 10S head, cam and carbie for sale. Can't recall the last time I saw that! It was a mobile number so no idea where they were located. They sent the email to RCCA.

    The dash was different (locally sourced VDO instruments); and they had a manual choke cable mounted on the passenger floor for the twin barrel weber. Also being based on the latest R10 at the time, they had an alternator rather than a generator but was mounted down in the generator location rather than up on the RHS head like a 12 setup.
    KB


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    From unique cars.com.au

    The 10S marked the end of the long line of rear-engined Renaults. It was no decorative limited-edition, though, and featured lots of upgrades over the regular 10. In France you could buy a 1300cc version but here, performance of the 10’s standard 1108cc unit was increased to create the ‘S’ by the fitment of an eight-port cylinder head (as opposed to the Siamesed ports of the usual unit), with larger valves and a different cam profile. A dual-throat Weber carburettor replaced a single-throat Solex item and there was a new exhaust system and new manifolds.
    The compression ratio was raised from 8.5:1 to 9.5:1 which, added to the mechanical changes, increased power from 46hp (34kW) to 60hp (45kW), torque from 81Nm to 88, and gave the 775kg sedan a decent performance increase. The 10S benefitted from other upgrades like wider 4.5-inch wheels (from the Gordini)...................


    1970 Renault 10S-News & Reviews-Unique Cars

    So I was wrong!

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    Fellow Frogger! potentz's Avatar
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    the 10s has larger inlet and exhaust valves.the cam profile is different(caravelle s spec) and 8 port cylinder head.

    the 10s goes significantly better than a standard r10!!!!!!.i have both engines in different cars .both engines in very good condition and tune.

    cheers brian
    Last edited by potentz; 5th July 2014 at 12:08 PM.

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    I'm sure the question has been answered before, but here is a slightly more beefed up reply.

    The 688-09 motor fitted to the later 8S and Australian 10S had the following sized valves (R10 Normale in brackets):

    Inlet - 33.5mm (31.2mm)
    Exhaust - 30.3mm (26.8mm)

    Also note that the larger 10S valves were also fitted to the later 688-02 motor installed in the last few hundred R10 Normales sold in Australia (688-02 engine number 850650 onwards).

    Camshaft timing:

    Inlet opens - 20 degrees BTDC (10 degrees)
    Inlet closes - 60 degrees ABDC (34 degrees)
    Exhaust opens - 60 degrees BBDC (46 degrees)
    Exhaust closes - 20 degrees ATDC (10 degrees)

    The 10S was really the equivalent of the HX Monaro LE and XC Falcon Cobra, in that it was a way of clearing the decks of Renault 10 bodies prior to the introduction of the 12. The 10S comprised all of the last batches of the Renault 10 CKD kits.
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    Fellow Frogger! R8philSA's Avatar
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    Thank you Simon and all others that replied. Quite a big difference really.

    Great to have so much knowledge available through friends willing to help.

    Cheers Phil

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    Member 61 Gordini's Avatar
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    Can you use the head off an 956 R8 engine, as I have been told they are an 8 port head ?

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    Quote Originally Posted by 61 Gordini View Post
    Can you use the head off an 956 R8 engine, as I have been told they are an 8 port head ?
    Yes you can, but they only have the small valves. Modern Motor magazine did the task in 1967, teaming the 8-port head with a single 42DCOE sidedraft and extractors for a considerable power boost.
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    Member 61 Gordini's Avatar
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    Thanks Simon

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    Too many posts! JohnW's Avatar
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    Quote Originally Posted by 61 Gordini View Post
    Can you use the head off an 956 R8 engine, as I have been told they are an 8 port head ?
    That used to be one of the standard "go fast" approaches for R8 1100 and R10 engines with their 6-port heads. Watch the compression ratio though - especially if the 956 head has been shaved a few times.....
    JohnW

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    Fellow Frogger! R10S FAN's Avatar
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    If, hypothetically - I had a set of 10S valves in my possession is it possible to fit them into a standard head? I was, hypothetically - looking at getting the head ported and polished too.
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    Quote Originally Posted by R10S FAN View Post
    If, hypothetically - I had a set of 10S valves in my possession is it possible to fit them into a standard head? I was, hypothetically - looking at getting the head ported and polished too.
    Hypothetically anything is possible. So if there is enough meat in the casting and new seats are available the valves should, hypothetically, fit. Have a chat with a decent engineering shop to find out.
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    I recall a thread on some specs for hot R10 camshafts, but it was pre-crash and I cannot find it...
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    1000+ Posts renault8&10's Avatar
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    Quote Originally Posted by julian View Post
    I recall a thread on some specs for hot R10 camshafts, but it was pre-crash and I cannot find it...
    You don't mean the thread about extractors that drifted off and started talking about cams, and specifically the one I run in my R10 do you? if so, I think the thread title was actually about extractors from memory. Should still be around. I put a cosworth A6 grind in, but recommend an A3 grind for most road cars.
    KB


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    Many years back I had a R8 with a Virage engine and a R8 8 port head, Ken Waggot cam, extractors, weber and it went like the clappers!
    Speedo needle went off the dial!
    The system worked well on that car, pulled very strongly in the top-end and heaps of revs ......although the comp ratio must have been high!

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