Forged pistons
30 July 2017 | 11:24 AM
#1
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Joined: Mar 2015
Posts: 40
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From: rhondda
Forged pistons
Ain't been on here for a while a mate of mine is rebuilding his bug eye engine and has sourced forged pistons and rings do u recommend he also uses forged conrods aswell or will it run fine with just standard ones.any ideas please?
30 July 2017 | 11:46 AM
#2
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Joined: Jun 2012
Posts: 2,260
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From: Aldershot
Depends on what boost he's wanting to run.
Anything over 300 bhp and I'd go Manley rods for piece of mind, strong and not too pricey really.
ACL race bearings are a good idea too.
May find that the forged pistons (mine are Mahle) are slappy when cold...it soon goes once warmed up (96% anyway) it's because they are very slightly undersized to allow them to expand in the bores.
Well fitted / clocked rings will see no oil loss.
Anything over 300 bhp and I'd go Manley rods for piece of mind, strong and not too pricey really.
ACL race bearings are a good idea too.
May find that the forged pistons (mine are Mahle) are slappy when cold...it soon goes once warmed up (96% anyway) it's because they are very slightly undersized to allow them to expand in the bores.
Well fitted / clocked rings will see no oil loss.
30 July 2017 | 11:59 AM
#5
You don't say whether he has STI or WRX rods... WRX rods will be good for 350bhp maybe slightly more... STI Rods up to 450.
If he's not planning on big power then, I'd save the cash and spend it on ARP head studs and decent head gaskets.
If it's a WRX he'll have gearbox issues way before he bends any rods... which would be more down to mapping and DET than the rods themselves.
All depends how much he wants to spend and what his plans are for the car too... as that will dictate build spec.
More info would be good.
If he's not planning on big power then, I'd save the cash and spend it on ARP head studs and decent head gaskets.
If it's a WRX he'll have gearbox issues way before he bends any rods... which would be more down to mapping and DET than the rods themselves.
All depends how much he wants to spend and what his plans are for the car too... as that will dictate build spec.
More info would be good.
30 July 2017 | 04:29 PM
#7
I'd just tell him to stick to the wrx rods if he's really short on cash, and like I said ARP head studs and maybe Cosworth gaskets...
As a side note, might be worth asking in the wanted section for some STI rods as it would make the car more desirable come sale time as well as future proofing.
At the end of the day, while it's out and in bits he may as well make a decent job of it.
As a side note, might be worth asking in the wanted section for some STI rods as it would make the car more desirable come sale time as well as future proofing.
At the end of the day, while it's out and in bits he may as well make a decent job of it.
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30 July 2017 | 04:36 PM
#8
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Joined: Mar 2015
Posts: 40
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From: rhondda
Thanks for the advice I will pass it on,u seem to know a lot about scoobys so would u know how to get around I have removed stock steering wheel off my blob eye and replaced it with omp wheel with short hub and sacrificed my horn would u know the wire under the column to relocate my horn lol