I don't even know where to start for searching this, so I might as well make an interesting post.
My A20A1 likes to rev no more than 6200-6300 RPM's. To my understanding, the vavle springs are the ones who complain.
Starting with a 2nd gen Prelude spring swap, how can I get more rev out of an A20??
Get a crank with a shorter stroke. Without that, the a20 will never be a rev happy motor. The a20 is not a "performance engine". Its long stroke and lousy rod/stroke ratio is its achilles heel, so to speak. The engine's lousy VE at hight rpm can be improved with cyl head/ intake/exhaust modifications and a larger cam, and stiffer valvesprings to accomodate higher rpm, but the shortblock will still have lousy geometry. It can be made to not disintegrate, with eagle ls length rods, but in my opinion the best way is to just not rev it much past the stock fuel cut (6.6k?) and use forced induction to make the power out of the increased torque instead of rpm.
excellent ^^^^^ explanation
Originally Posted by roodoo2
Agreed^^!!
Thanks Accordtheory for that post. That helps quite a bit.
yeah ...you need better springs and a nice cam...my motor hits lock up at around 5800 RPM...all you really need is an adjustable cam gear and advance the motor alot
1989 Honda Accord LX-i
B18c1 swap since 7/2011
175whp and 132tq
Redzone tuned
Lock up?? Is that peak HP?? I race shift at about 5700 and no more, cuz that is where the powerband falls. I want to be able to hit at least 7g sometime in it's life.
well why did the a20a2 i have have power to 7000rpm and rev right around to 8 lol
Good Question^^^ And I would love a reply.
Are the A20A2's JDM?
^^ basically outside the states only I think. Since they have less emissions controls. Damn California for keeping us from getting good engines.
Lostforawhile:we have to pick on him he's CAH he spray painted himself into this corner with the accord.
Better than Japan... I'm glad I live in Oregon.
And Damn California for giving me a ticket for going 80 in a 65 at 1:20 in the morning!
Last edited by Bass Man; 03-26-2008 at 10:59 PM.
here is my power band before the tune....now my car is fully tuned but i dont have a graph
1989 Honda Accord LX-i
B18c1 swap since 7/2011
175whp and 132tq
Redzone tuned
That is with a cam, cam gear, and vavle springs?
no that was just with cold air intake, headers, exhaust, obd1 swap with a base map of the pr4,
now i have a cam and cam gear...i still need to advance it a bit to get more low end torque.
here is a better scan of my first dyno run with just cold air intake and exhuast.
1989 Honda Accord LX-i
B18c1 swap since 7/2011
175whp and 132tq
Redzone tuned
Damn, I still have hope for my A20! What is your 0-60 roughly?? I can usually pull off 8-10 seconds consecutively.
my b20a puts out twice that and its stock with a pod filter and koni shocks :P
Messy why is Your engine dont give out more than 110HP? Is it Carb or? My dos 125@166here is a better scan of my first dyno run with just cold air intake and exhuast.
Its prttey fnuny how you can raed tihs eintre snetnece with all tehse ellters out of palce...
My Build Thread
no shit??
that is something to look forward too!!
the graphs show power that reaches the wheels...not at the engine.
so my car made 112whp so to the crank im making 128hp to the crank. right now i think im making like 130hp to the crank
1989 Honda Accord LX-i
B18c1 swap since 7/2011
175whp and 132tq
Redzone tuned
nah just playin wit messy. one day it will :P
130hp from the engine isnt too bad for the old a20a engine.
I hope I can reach the 150 mark by the time I want to upgrade to something better.
I got the idea when I saw a Type R, 0-60. That thing would go to 9g, shift down to 7g and power back up to 9g, then shift again... Sweet...
you dont wanna spin this engine much beyond the stock rev limiter, you start running into valve float at 7250-7400 rpm, plus with such a long stroke its hard on the bearings and you may end up stretching rod bolts (spun rod bearings) even on my fully built engine, 7200rpm is plenty
429whp 362wtq A20 TURBO. A20T>*
I beg to differ, rod ratio isn't far off the same as a B18C engine and they like to rev high, and all my engines have all been very rev happy and pickup really quick especially with lightened flywheel. I've had 8000rpm engines before on A18 head and A20 block with just 285 degree cam and have had ET1 engine that revved to 7500 with just 272 degree cam, hell my stock ET engine in my red lude with twin Kei Hein's revs to 7rpm without protest but the power does drop a little after 6.5krpm due to the stock cam.
With the research i've done i think that it's still possible to build an A20/ET1 which is able to rev happily to 9000rpm but you would need aftermarket rods and pistons to stop it from blowing up anything over 7k rpm you'll need at least aftermarket rods and might as well get pistons as well if your going to that trouble. With an engine that likes to rev you need to make sure you have the best exhaust and intake system you can get this is what ultimately restricts the flow not the rod ratio (yes to a certain extent at much higher revs). Don't forget some A20 use very restictive exhaust manifold 4-1 design the 2G ludes had nice 4-2-1 design, headwork/inlet manifold flopwing also really helps with extra revs typically i've seen powebands increase from 500-1000rpm from properly done headwork/manifolds (depends on the head and number of valves).
The A20 i'm building will hopefully be able to turn at least 8.5k-9k rpms and stay together as for power should be seeing around 220-230bhp maybe bit more if i can get the CR ratio high enough. But we all know that this isn't coming cheap with welding done to the head, custom larger valves etc, maybe even titanium rods and wrist pins for the extra rpms.
Deffinantly looking forward to it.
On a side note, will the 2g Prelude ewxaust manifolds fit right up to an A20? I just had a look at my manifold with the heat shield off of it, and that is one ugly header.
^^ I doubt that it will. Why don't you just buy a pacesetter or get one custom made?
Lostforawhile:we have to pick on him he's CAH he spray painted himself into this corner with the accord.
Cuz I got no job and about $450 worth a tickets in front of me.
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