rjudgey
05-24-2011, 05:06 AM
Right everyone, as you may or may not know I have quite a lot of these EDM B20A's and finally going to be building one!! Yay!!
Now I'm entering a budget race challenge I get £999 plus £250 for old parts I can sell.
Now the car was free and was in all working order, got some springs, and shocks hopefully coming together, and new brakes and pads already sorted.
What I need is some more info on what engine parts i can possibly use to increase HP on this engine! I'll list the things I do have and what I plan on doing, this engine is going to be N/A turbo is just too much for the budget and feel the added weight an torque steer will decrease performance in the handling section
Ok so i have a choice of 3 blocks and 3 heads to get the best ones, I'll probably keep one together as a reference on how they go back together again! 1 of which is stripped down bare and the other is in two complete pieces head and block and the other is in the car still.
I've been mucking around with porting and flowing and have some pretty good ideas on what to do with the inlet and exhaust ports.
1: Heavily modify inlet ports and exhaust ports, reshaping valve guide ramps, and filling the injection notches to make the port flow nicely to the manifold, bronze guides fitted from SI and the ends reshaped to match the port work around the guide ramps.
2: Valves were going up a size I have a set of Blanks from SI valves that use the same stem sizes and I'll be jumping to 34mm on inlet side and 30mm on exhaust size both are stainless steel and will be backcut to match the new race seats that I'll have machined in.
3: Head and Block will be loosing some material looking at shaving 1mm off the head and .5mm off the block this will raise the CR ratio up nicely as well as make my F22 cam pulleys line up a little better.
4: Pistons this is where it gets a little sticky the JDMB20A has 22mm wrist pins the EDM ones are smaller I think mayeb 20mm or 21mm can't remember off top of my head anyone know without me having to dig one out from the bottom of my parts buckets! B20A5 are 22mm as well, not sure what to use here can we drop in B18A pistons looking at 82mm with a high compression trying to get to somewhere like 12:1. I do have wiseco forged pistons for B20A5 and Crower H23 rods but this was initially for a turbo setup so the CR ratio is 9:1 and the rods are seriously weighty unlike stock or the light weight N/A ones they do now, I also have a Eagle crank as well but as I'm sticking with N/A i don't think this should be needed! So basically looking for a easy to plug and play setup that doesn't need money spending on machining parts to fit each other and also common enough that they won't cost a fortune or possibly find 2nd hand. I don't mind using stock pistons and rods if they are upto the job. I'm aiming for as much N/A power as possible around 250bhp at flywheel.
5: Intake well that's sorted custom inlet manifold in stainless with 6" runners and pair of well modified Weber DCOE 45's which are capable of 250-260bhp easily they running modded chokes that are 42mm in size as well as flowed internals and butterfly screws removed and countersunk ones fitted and ground flush to spindle.
6: I believe the EDM flywheel is pretty heavy similar to A20 one so will be getting machine lighter, I believe as well that the A20 pressure plate and disk should fit can anyone confirm if so will be ordering up a stronger setup from clutchnet to use as anything less than this will either break or slip.
7: Gearbox if I fit an LSD from a newer Civic from Quaife or similar make anyone know the exact years? And also if i fit the LSD will this solve the problem of the stock diff breaking the pins holding it together and chewing through the gearbox casing? Std axles look in good shape and have a few of these to choose from.
8: Exhaust looking at getting a B20A5 header and have custom downpipe made up with 2" diameter piping into a 2.5" collector and mandrel bent system with sports silencers this should let the engine breathe properly!
Any more ideas on extra power and what parts they recommend please let me know! Be nice to see a serious B20A build going on looks like it's been a bit quiet here lately! thanks Rich!
Now I'm entering a budget race challenge I get £999 plus £250 for old parts I can sell.
Now the car was free and was in all working order, got some springs, and shocks hopefully coming together, and new brakes and pads already sorted.
What I need is some more info on what engine parts i can possibly use to increase HP on this engine! I'll list the things I do have and what I plan on doing, this engine is going to be N/A turbo is just too much for the budget and feel the added weight an torque steer will decrease performance in the handling section
Ok so i have a choice of 3 blocks and 3 heads to get the best ones, I'll probably keep one together as a reference on how they go back together again! 1 of which is stripped down bare and the other is in two complete pieces head and block and the other is in the car still.
I've been mucking around with porting and flowing and have some pretty good ideas on what to do with the inlet and exhaust ports.
1: Heavily modify inlet ports and exhaust ports, reshaping valve guide ramps, and filling the injection notches to make the port flow nicely to the manifold, bronze guides fitted from SI and the ends reshaped to match the port work around the guide ramps.
2: Valves were going up a size I have a set of Blanks from SI valves that use the same stem sizes and I'll be jumping to 34mm on inlet side and 30mm on exhaust size both are stainless steel and will be backcut to match the new race seats that I'll have machined in.
3: Head and Block will be loosing some material looking at shaving 1mm off the head and .5mm off the block this will raise the CR ratio up nicely as well as make my F22 cam pulleys line up a little better.
4: Pistons this is where it gets a little sticky the JDMB20A has 22mm wrist pins the EDM ones are smaller I think mayeb 20mm or 21mm can't remember off top of my head anyone know without me having to dig one out from the bottom of my parts buckets! B20A5 are 22mm as well, not sure what to use here can we drop in B18A pistons looking at 82mm with a high compression trying to get to somewhere like 12:1. I do have wiseco forged pistons for B20A5 and Crower H23 rods but this was initially for a turbo setup so the CR ratio is 9:1 and the rods are seriously weighty unlike stock or the light weight N/A ones they do now, I also have a Eagle crank as well but as I'm sticking with N/A i don't think this should be needed! So basically looking for a easy to plug and play setup that doesn't need money spending on machining parts to fit each other and also common enough that they won't cost a fortune or possibly find 2nd hand. I don't mind using stock pistons and rods if they are upto the job. I'm aiming for as much N/A power as possible around 250bhp at flywheel.
5: Intake well that's sorted custom inlet manifold in stainless with 6" runners and pair of well modified Weber DCOE 45's which are capable of 250-260bhp easily they running modded chokes that are 42mm in size as well as flowed internals and butterfly screws removed and countersunk ones fitted and ground flush to spindle.
6: I believe the EDM flywheel is pretty heavy similar to A20 one so will be getting machine lighter, I believe as well that the A20 pressure plate and disk should fit can anyone confirm if so will be ordering up a stronger setup from clutchnet to use as anything less than this will either break or slip.
7: Gearbox if I fit an LSD from a newer Civic from Quaife or similar make anyone know the exact years? And also if i fit the LSD will this solve the problem of the stock diff breaking the pins holding it together and chewing through the gearbox casing? Std axles look in good shape and have a few of these to choose from.
8: Exhaust looking at getting a B20A5 header and have custom downpipe made up with 2" diameter piping into a 2.5" collector and mandrel bent system with sports silencers this should let the engine breathe properly!
Any more ideas on extra power and what parts they recommend please let me know! Be nice to see a serious B20A build going on looks like it's been a bit quiet here lately! thanks Rich!