cdg Posted January 29, 2002 Share Posted January 29, 2002 Could anyone tell me the dimensions of the Vauxhall 16V 2ltr connecting rod, as this is not an engine I have ever worked on. I need to know: Length between centres Width of big end housing Crankpin diameter. I have tried QED, SBD, but no-one available to tell me! Many thanks, Chris. Link to comment Share on other sites More sharing options...
Paul Turner Posted January 29, 2002 Share Posted January 29, 2002 Chris Don't do it, it will not fit a x-flow. Paul Link to comment Share on other sites More sharing options...
Peter Carmichael Posted January 29, 2002 Share Posted January 29, 2002 ISTR 148mm rod length Link to comment Share on other sites More sharing options...
cdg Posted January 29, 2002 Author Share Posted January 29, 2002 Paul, Ha ha! Depends on the width... Chris. Link to comment Share on other sites More sharing options...
EFA Posted January 29, 2002 Share Posted January 29, 2002 Length between centres - std 143mm (Peter, 148's are not std) Width of big end housing - approx 24.20mm on std crank - Rod endfloat should be 0.100mm Crankpin diameter 48.970mm - 48.988mm Why do you need to konw?? This isfo is best obtained from Arrow Engineering or Swindon Racing Engines - details on my site below in the links section. Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Peter Carmichael Posted January 29, 2002 Share Posted January 29, 2002 Well that's twice I have been wrong about Vauxhalls in one day. The figure I was using was built into my reciprocating forces model and I thought it came from info supplied by Chelspeed, but I must have translated 143 into 148. I thought 148 seemed a bit long. Link to comment Share on other sites More sharing options...
EFA Posted January 29, 2002 Share Posted January 29, 2002 He's got silly pistons......... Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
cdg Posted January 29, 2002 Author Share Posted January 29, 2002 Many thanks for your replies chaps. I was thinking of using a set in a (let's just say) non-Vauxhall application. I've got a big hammer so I can make tham fit....! Cheers, Chris. Link to comment Share on other sites More sharing options...
Chelspeed Posted January 29, 2002 Share Posted January 29, 2002 Yep, Omega slipper pistons. The gudgeon pins right up high and very short, you have to take the oil ring off to remove the pin. The pistons are dead short so the rods are longer to compensate, the skirts are also cut away. Pistons weigh 257g bare and the pins 83g. The benefits are reduced weight and reduced friction due to less skirt. Downside is that you need a special set of rods and the pistons rock more so allegedly wear more but I haven't seen any sign of this. Link to comment Share on other sites More sharing options...
cdg Posted January 29, 2002 Author Share Posted January 29, 2002 Chelspeed, What's the compression height of the Omega piston you are using? Chris Link to comment Share on other sites More sharing options...
NickD Posted January 29, 2002 Share Posted January 29, 2002 Std rod b/e width is 26.35mm, c/c is 143mm. Small end is 22mm wide with 21mm gudgeon pin. Compression height of std Mahle piston is 30.5mm Link to comment Share on other sites More sharing options...
EFA Posted January 29, 2002 Share Posted January 29, 2002 I conceed to Nicks dimension on the rod b/e width. Welcome to Blatchat Nr Dinsmore..... Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Chelspeed Posted January 30, 2002 Share Posted January 30, 2002 What do you mean by compression height? When I build the engine I measure the height of the flat bit of the piston above the block but the intruder bit sticks up a lot more. I then measure the volume above the block (by dropping the piston exactly 5mm down the bore, pipetting the volume left and calculating the difference from measured and pi x bore x bore x 0.25 x 0.05). From this, combustion chamber volume (more pipetting) and head gasket thickness you can calculate the head skimming you need to get 12.0:1. Link to comment Share on other sites More sharing options...
cdg Posted January 30, 2002 Author Share Posted January 30, 2002 Once again, very many thanks for your replies. Chelspeed, "Compression height" refers to the dimension from the centre of the Gudgeon pin to the top face of the piston, not including the "intruder" bit. If std. are 30.5mm then you must have pistons with a compression height of 25.5mm, as your rods are 5mm longer than std. (or thereabouts). So they should work a treat in my monster x-flow... (Don't ask!) Thanks for your input. chris. Link to comment Share on other sites More sharing options...
Chelspeed Posted January 30, 2002 Share Posted January 30, 2002 Interesting. I've got a spare set of 86mm pistons going cheap. I've never bothered advertising cos I thought the need for special rods would put anyone off. But if they'll fit something else that doesn't apply. Interested? I'll measure the pin to deck height tonight but as you say it should be 5mm less than standard. Link to comment Share on other sites More sharing options...
EFA Posted January 30, 2002 Share Posted January 30, 2002 I've got 4 Mahle std psitons with 2mm pockets a la Swindon 235 if anyones interested.... Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
I reply to every thread Posted January 30, 2002 Share Posted January 30, 2002 I might be - in a years time! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now