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Looking for rods and pistons for B230FT rebuild
- Thread starter mertz
- Start date
OVERDRIVE
Well-known member
- Joined
- Jul 31, 2017
- Location
- Brooklyn, Neu York
I'd buy a cast piston if you're not exceeding 400hp, maybe even 500hp. A forged piston expands at a larger rate than a cast piston so the cylinder wall clearances are larger, and they'll slap when cold.
Really depends on a lot of things regarding the piston slap. Loose PTW clearance will do it, but it can be mitigated/eliminated with skirt coatings. Proper PTW for the application results in the pistons being pretty quiet.
I'd buy a cast piston if you're not exceeding 400hp, maybe even 500hp. A forged piston expands at a larger rate than a cast piston so the cylinder wall clearances are larger, and they'll slap when cold.
Theres also high silica forgings which expand a lot less.
That’s a really good deal for pistons and rods.
Have the piston to wall clearances set for the application. I tend to go for the tighter side because most of the guidelines are set for worst case scenario. 15psi turbo daily driver making 300hp and 30+ psi race turbo are very different clearances, but the spec sheet usually lists “turbo” and it’s for the high performance one.
OVERDRIVE
Well-known member
- Joined
- Jul 31, 2017
- Location
- Brooklyn, Neu York
No, stock 2nd oversize is 96.6mm, and the head gasket hole is 97mm. You'll be fine.
OK, looks like I need to find one for sale. I know Elring is the go to for standard, is there an equivalent 97mm?
OVERDRIVE
Well-known member
- Joined
- Jul 31, 2017
- Location
- Brooklyn, Neu York
Erling is the good composite option. You can also choose to tighten the piston to head clearance with an MLS gasket. Too much to go into about that here, you can read about it here. I've ran both with no issues. If your block is torn down then it would probably be best to get the pistons .012" or so out of the hole and use a stock Elring.
classicswede
Volvo upgrades
- Joined
- Sep 20, 2005
- Location
- North Wales
96.6mm is ok but 97mm does risk bore flex with high boost.
Elring is what I use in our builds and they are know good quaility gaskets. MLS gaskets can be a paint to get to fully seal. Depending on power upgraded bolts or converting to studs is worth doing.
make sure your pistons and rods match
Elring is what I use in our builds and they are know good quaility gaskets. MLS gaskets can be a paint to get to fully seal. Depending on power upgraded bolts or converting to studs is worth doing.
make sure your pistons and rods match
- Joined
- Nov 19, 2002
- Location
- Northern Washington
Did JVL hang it up? Seems like after some trial and error he managed a combination of pistons and H-Beam rods for Volvo four cylinder engines that work.
According to Omega the do not include a PTW clearance. They spec a finished bore size, which would be 96.5mm in your case. I would call Omega and see what they recommend, and if they will tell you where the gauge point is.
Unless you do a really good job on locating the gauge location of the piston, it's very easy to mismeasure a piston. They are not round at all.
Explained: Symmetrical, Asymmetrical, and Full-Round Piston Skirt Design
There are several different styles of piston skirts, all of which play a vital role in how the engine operates. Learn the difference and make the right call!
info.jepistons.com
Everyday is a school day! Thanks for that.According to Omega the do not include a PTW clearance. They spec a finished bore size, which would be 96.5mm in your case. I would call Omega and see what they recommend, and if they will tell you where the gauge point is.
Unless you do a really good job on locating the gauge location of the piston, it's very easy to mismeasure a piston. They are not round at all.
Explained: Symmetrical, Asymmetrical, and Full-Round Piston Skirt Design
There are several different styles of piston skirts, all of which play a vital role in how the engine operates. Learn the difference and make the right call!
Will see what Omega recommend togther with machine shop and go from there