ZRP Forged Conrods
Discussion
Most of the blokes I've worked with in engineering have always referred to 'Verniers' as 'very nears' and only used them for checking they're not mis-reading a micrometer by half a turn.
One of these with a rod anvil would be a far more useful piece of equipment.
https://www.cromwell.co.uk/shop/measuring-and-test...
One of these with a rod anvil would be a far more useful piece of equipment.
https://www.cromwell.co.uk/shop/measuring-and-test...
As promised some pics of one of the MGB cheapy rods.
Pics 1 and 2 point of max ovality each side of rod.
Pic 1
pic 2
cheap rod, each side different thickness.
Robson/Farndon rod sections are the same.
Peter
Blackened areas where oil has got behind bearing and burned because of ovality. Shiny bit each side of cap split only area on size.
Apologies for edits, the pics were all over the place!
Pics 1 and 2 point of max ovality each side of rod.
Pic 1
pic 2
cheap rod, each side different thickness.
Robson/Farndon rod sections are the same.
Peter
Blackened areas where oil has got behind bearing and burned because of ovality. Shiny bit each side of cap split only area on size.
Apologies for edits, the pics were all over the place!
Edited by PeterBurgess on Tuesday 3rd January 15:12
Edited by PeterBurgess on Tuesday 3rd January 15:14
Edited by PeterBurgess on Tuesday 3rd January 15:15
Op never came back.....
Some pics of the cheapo rods, can't really find fault with them, though I can see a bit of a different design feature to the ones in the previous post.
All within .2g of each other and everything centralised, at least they label the caps unlike some others. I remember a thread from just over a year ago now where the poster may have got them mixed up or wrong way round...
Some pics of the cheapo rods, can't really find fault with them, though I can see a bit of a different design feature to the ones in the previous post.
All within .2g of each other and everything centralised, at least they label the caps unlike some others. I remember a thread from just over a year ago now where the poster may have got them mixed up or wrong way round...
At Autosport there were a few places with rods, was surprised ZRP werent there though.
Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
stevieturbo said:
At Autosport there were a few places with rods, was surprised ZRP werent there though.
Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
Thanks for the link, some good parts in there, it's a shame there are no weights in the catalogue. Probably ZRP have no need to go any more....Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
What did you think to Autosport? Everyone you speak to says it's not that good anymore and it gets smaller every year. I didn't go as it's our busiest time of the year so couldn't really take a day off and with a few exceptions it is often the same old stands every year. I was talking to the ARP rep the other day and he said he'd heard nothing but good things about ZRP too.
stevieturbo said:
At Autosport there were a few places with rods, was surprised ZRP werent there though.
Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
I only pick them up one at a time ;-)Some of the nicest visually were from Italian RP
They werent the cheapest, but certainly not that expensive either and visually very nice.
http://www.italianrp.it/indexeng.html
Wiseco also had some nice looking rods...but holy feck they were heavy.
227bhp said:
Thanks for the link, some good parts in there, it's a shame there are no weights in the catalogue. Probably ZRP have no need to go any more....
What did you think to Autosport? Everyone you speak to says it's not that good anymore and it gets smaller every year. I didn't go as it's our busiest time of the year so couldn't really take a day off and with a few exceptions it is often the same old stands every year. I was talking to the ARP rep the other day and he said he'd heard nothing but good things about ZRP too.
I thought it was very good, but then it depends what the expectations are before going. TBH if I was to go next year I'd just go Thursday and Friday, as I have far less interest in the other ste and the more interesting stuff is on the trade days.What did you think to Autosport? Everyone you speak to says it's not that good anymore and it gets smaller every year. I didn't go as it's our busiest time of the year so couldn't really take a day off and with a few exceptions it is often the same old stands every year. I was talking to the ARP rep the other day and he said he'd heard nothing but good things about ZRP too.
Some rod pics from the show.
The Subaru Wiseco's were something insane like 610g, the Italians around 530 I think. Carillos for comparison are around 535g too.
Even in the hand, the Wiseco's were very noticeably heavy compared to anything else.
https://postimg.org/gallery/31ttbzlrg/
photo host
e21Mark said:
Are forged rods always going to be heavier?
Also, how is the added weight likely to impact on running/performance? (If at all)
Heavier than what? Presumably OE...Also, how is the added weight likely to impact on running/performance? (If at all)
There is no rule, it depends on how advanced the originals were and well, how cleverly designed the new ones are too, as I think I pointed out earlier the ones we fit on 80s/90s stuff are a big improvement on OE, but you're going to have to go some way to beat a top end late model Honda or similar rod. It's down to design and material strength, the more expensive you go generally the better they get.
Scales are cheap on Ebay, get busy.
They are both forged btw, lol, you wouldn't have a cast rod, billet maybe....
Boosted LS1 said:
^ That said, I recently opened up a 1974 Pontiac 400 engine. It had cast rods inside. I thought they'd been phased out in the 50'ies.
Cast rods We had a modern engine apart the other day and it was interesting how they'd managed to make sure each cap went back where it came from. I don't know what it's called, or how they do it, but the mating surfaces look like a piece of cast which has been snapped (like the surface of a rough stone), clever stuff.
227bhp said:
Cast rods
We had a modern engine apart the other day and it was interesting how they'd managed to make sure each cap went back where it came from. I don't know what it's called, or how they do it, but the mating surfaces look like a piece of cast which has been snapped (like the surface of a rough stone), clever stuff.
As the name implies...cracked cap.We had a modern engine apart the other day and it was interesting how they'd managed to make sure each cap went back where it came from. I don't know what it's called, or how they do it, but the mating surfaces look like a piece of cast which has been snapped (like the surface of a rough stone), clever stuff.
Very common these days
What is ore surprising is this video would imply that if you buy a brand new rod from a dealer..it is uncracked. Either that or the new halves were securely mated together ( which is part of the reason for doing the cracked cap, if you get them to fret or move something has went badly wrong !! )
https://www.youtube.com/watch?v=UaatYvC6T-w
https://www.youtube.com/watch?v=QlVrDJBiqd4
227bhp said:
Boosted LS1 said:
^ That said, I recently opened up a 1974 Pontiac 400 engine. It had cast rods inside. I thought they'd been phased out in the 50'ies.
Cast rods We had a modern engine apart the other day and it was interesting how they'd managed to make sure each cap went back where it came from. I don't know what it's called, or how they do it, but the mating surfaces look like a piece of cast which has been snapped (like the surface of a rough stone), clever stuff.
rachaeljf said:
Really? That's remarkable. I see stress raisers there that could severely curtail the life of these rods. Thanks for the info, much obliged!
If they were failing there it would be an issue, but they don't. Most of the time they're over specified (in terms of design and material) so a bit of poor finishing like that has no effect lthough it really depends on the end use.Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff