Engine build 2.0, CR, help
#1
Engine build 2.0, CR, help
I've been looking into engine builds and would like another engine built. Im looking at a reliable 400 withh all the available torque. Would like torque lower down. Now I know for this you need a higher compression ratio maybe 9:0.1? And also a lot of boost but I want to know what block would be ideal to use to do this and what studs and what size, also what size headgasket?
For example I know open deck may not be a great choice so might go for semi closed but would a open deck fully forged 9:0.1 CR ratio with arp 11m studs be able to run 1.8-2.0bar off boost? And not too damaging on the timing etc?
For example I know open deck may not be a great choice so might go for semi closed but would a open deck fully forged 9:0.1 CR ratio with arp 11m studs be able to run 1.8-2.0bar off boost? And not too damaging on the timing etc?
#3
Scooby Regular
iTrader: (7)
Hi there
Have look on those two threads
http://bbs.22b.com/forums/showthread...ow-compression
http://bbs.22b.com/forums/showthread...ression-ratios
Hope helps
Jura
Have look on those two threads
http://bbs.22b.com/forums/showthread...ow-compression
http://bbs.22b.com/forums/showthread...ression-ratios
Hope helps
Jura
#4
Hi there
Have look on those two threads
http://bbs.22b.com/forums/showthread...ow-compression
http://bbs.22b.com/forums/showthread...ression-ratios
Hope helps
Jura
Have look on those two threads
http://bbs.22b.com/forums/showthread...ow-compression
http://bbs.22b.com/forums/showthread...ression-ratios
Hope helps
Jura
#7
Scooby Regular
iTrader: (7)
Yes open deck block,we are made 490bhp on V-power and 20% meth without the NOS
Spec has been this:
Cosworth pistons
Manley Rods
ACL Race Bearing sets:big end and main bearing set
Cosworth baffled sump
10mm Modified Oil pump and water pump
11mm ARP Headstuds
Cosworth Stopper HG
79mm Subaru V8(EJ257) Nitrided Crankshaft
Cosworth timing belt kit
Jura
Spec has been this:
Cosworth pistons
Manley Rods
ACL Race Bearing sets:big end and main bearing set
Cosworth baffled sump
10mm Modified Oil pump and water pump
11mm ARP Headstuds
Cosworth Stopper HG
79mm Subaru V8(EJ257) Nitrided Crankshaft
Cosworth timing belt kit
Jura
Trending Topics
#8
If you are going to run 9.0:1 you will need CDB & 14mm stud conversion with Cosworth gaskets or you risk HG failure. I personally would run about 8.5:1 you could then use a SCDB with 11mm Cosworth studs & gaskets. A 2.1 stroker would be a good option unless you can afford to go 2.35, 2.5 will give the best spool & torque but is the most fragile.
#9
If you are going to run 9.0:1 you will need CDB & 14mm stud conversion with Cosworth gaskets or you risk HG failure. I personally would run about 8.5:1 you could then use a SCDB with 11mm Cosworth studs & gaskets. A 2.1 stroker would be a good option unless you can afford to go 2.35, 2.5 will give the best spool & torque but is the most fragile.
#10
SCDB may work, but 9.0:1 is a high CR & it may take a lot to keep it all together especially if you want to up the power & boost at some point. If you stick to 400 it should be OK but once you get used to 400 you'll want more.
#16
#19
Scooby Regular
iTrader: (2)
The main question is what fuel your going to run, & if your building an engine you should be building your compression ratio into the build not tweaking it with gasket thickness at the end to suit what you have bought piston & head wise, imo you should run the thinnest gasket available, as they are more durable.
#20
The main question is what fuel your going to run, & if your building an engine you should be building your compression ratio into the build not tweaking it with gasket thickness at the end to suit what you have bought piston & head wise, imo you should run the thinnest gasket available, as they are more durable.
#21
Scooby Regular
iTrader: (7)
There are also the cams and valves to consider as these are going to need to be matched to get the torque your after, revier cams tend to produce less torque.
If you want it to rev and have plenty of torque your going to need to go 2.1, and get uprated valve train and cams.
Why the opposition to going 2.1? it's by far the easiest and most proven route to get what your after.
It's all about balancing top and bottom end, just running a higher CR alone will not necessarily produce the characteristics your after, but the 2.1 and cams will.
If you want it to rev and have plenty of torque your going to need to go 2.1, and get uprated valve train and cams.
Why the opposition to going 2.1? it's by far the easiest and most proven route to get what your after.
It's all about balancing top and bottom end, just running a higher CR alone will not necessarily produce the characteristics your after, but the 2.1 and cams will.
#22
Scooby Regular
iTrader: (7)
The main question is what fuel your going to run, & if your building an engine you should be building your compression ratio into the build not tweaking it with gasket thickness at the end to suit what you have bought piston & head wise, imo you should run the thinnest gasket available, as they are more durable.
I might even chuck him some bit's to machine and bolt together for me.
#23
There are also the cams and valves to consider as these are going to need to be matched to get the torque your after, revier cams tend to produce less torque.
If you want it to rev and have plenty of torque your going to need to go 2.1, and get uprated valve train and cams.
Why the opposition to going 2.1? it's by far the easiest and most proven route to get what your after.
It's all about balancing top and bottom end, just running a higher CR alone will not necessarily produce the characteristics your after, but the 2.1 and cams will.
If you want it to rev and have plenty of torque your going to need to go 2.1, and get uprated valve train and cams.
Why the opposition to going 2.1? it's by far the easiest and most proven route to get what your after.
It's all about balancing top and bottom end, just running a higher CR alone will not necessarily produce the characteristics your after, but the 2.1 and cams will.
#24
Scooby Regular
iTrader: (2)
If going 2.1, Wiseco do stroker pistons in 12, 16 & 20cc crowns, head wise if going to Supertech valves over OE they raise the chamber volume by 1 to 1.5cc, it all wants measuring, as with cams your static 9.0 to 1 ratio will be eaten into with larger duration & lift cams, effectively lowering your dynamic ratio.
#26
If going 2.1, Wiseco do stroker pistons in 12, 16 & 20cc crowns, head wise if going to Supertech valves over OE they raise the chamber volume by 1 to 1.5cc, it all wants measuring, as with cams your static 9.0 to 1 ratio will be eaten into with larger duration & lift cams, effectively lowering your dynamic ratio.
#28
Lol I can see where this is going. I dont really want to mess around with my heads. Ive got v6 uk heads, benefit to swithcing to v6 sti heads? Anti lag? Also I want the torque without losing much rev. Car will be used mainly on road but would like to track once or twice a year and dragstrip