Probably HP output of 12A
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Probably HP output of 12A
I've got a 12A stripped of all emisions, header, no cats, free flow muffler, stock carb (minus lots of parts believe it or not there is a normal carb under all that junk). What is the likely HP output of this motor?
thanks,
Daniel
thanks,
Daniel
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your setup sounds almost IDENTICAL to mine. my motor has about 50,000 on the rebuild. same as you though, 12a, no cats, no emissions, rb header, 2 1/4" piping, high flow muffler, i also removed my a/c, air pump, and replaced the fan with a serperate electric one. my car dyno'd at 108 rwhp at 7,000rpms. 103lb/ft tq at 5,500. my hp was still climbing with my revs, but i let off. it was just for a base run, i'm bout to do alot of other stuff then go back and rev it out a bit more. but yea, you should be lookin at around 110 or so hp granted your motor, tranny, clutch are all in good condition. you may have more, my clutch is kinda crappy.
-zac
-zac
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cool, those numbers look good.. i think the motor is around 20K it was pulled because the car was given to me to go into my 78 MG midget. Thsoe numbers sound encouraging. I think i'll eventualy look for more, but that should be enough to have fun for now. Thanks
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mine has 143k miles on it and the rats nest is still there, a/c was hooked up, and 107 rwhp and 96.1 ftlbs of torque. thats not much lower than what yall pulled. im just surprise my motor did that
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I have a question. I have a 12a, and i hear that 200 hp isnt that hard to get. Someone said they got more than that just from a streetported motor, but i dont believe it. Ide love to have smooth & drivable 200 hp. Noone really knows? I have stock carb, but full racing beat street port exhaust. Its hard for me to see adding a good carb/intake and street port giving me this much more power to get me to 200 or more. Am i wrong?
#10
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Originally posted by RotaryMotorDisorter
I have a question. I have a 12a, and i hear that 200 hp isnt that hard to get. Someone said they got more than that just from a streetported motor, but i dont believe it. Ide love to have smooth & drivable 200 hp. Noone really knows? I have stock carb, but full racing beat street port exhaust. Its hard for me to see adding a good carb/intake and street port giving me this much more power to get me to 200 or more. Am i wrong?
I have a question. I have a 12a, and i hear that 200 hp isnt that hard to get. Someone said they got more than that just from a streetported motor, but i dont believe it. Ide love to have smooth & drivable 200 hp. Noone really knows? I have stock carb, but full racing beat street port exhaust. Its hard for me to see adding a good carb/intake and street port giving me this much more power to get me to 200 or more. Am i wrong?
RB streetport exhaust takes some power away. I think you'd be luck to get 185 hp at flywheel.
-bp-
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Glad to see this has spawned an interesting discusion.. .. and i just realized i must look like a 4 year old idiot, as i put probably insteat of probable! HAHA.. Oh well.
I can't wait to get my car done and dyno it so we can see how close you guys where. sounds like 110 to 120 at the ground is probable as i am going to use a aftermarket carb and intake. We'll see how this goes. I'm trying to build the car for <$2004 for the next Grassroots motorsports challenge if it occurs.
Thanks for the help,
Daniel
I can't wait to get my car done and dyno it so we can see how close you guys where. sounds like 110 to 120 at the ground is probable as i am going to use a aftermarket carb and intake. We'll see how this goes. I'm trying to build the car for <$2004 for the next Grassroots motorsports challenge if it occurs.
Thanks for the help,
Daniel
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Going back to the original question I predict 105rwhp with what you have got.
But of course it can vary 10% due to dyne inaccuracy, temperature, fuel etc. The critical test is how quick is the standing 1/4 mile. My prediction is about 16.3-16.5 seconds. A top gen 1 street legal car will get down to 10 seconds with over 500rwhp.
But of course it can vary 10% due to dyne inaccuracy, temperature, fuel etc. The critical test is how quick is the standing 1/4 mile. My prediction is about 16.3-16.5 seconds. A top gen 1 street legal car will get down to 10 seconds with over 500rwhp.
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i can't wait to get a better carb and finally get my car on the track against some ricers there's a bunch of civic guys here that claim this and that and i've already whooped up on some hatches with swaps! AAHAHAHAHHAHAHAHAHAH I LOVE IT!
-zac
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Thanks for answering my question. So open headers is what it takes to pretty much get up to 200 hp and over huh? Well, maybe i should just order up a TII i mean i look at them online everyday!
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With a 12a and a desire to generate 200 hp you have 3 choices
- rebuild with a large strretport or bridgeport and
get a high performance carb, such as a Weber IDA
48 plus a good header/exhaust system.
- add a blow through gen 2 turbo with a side draft
carb such as a Weber DCOE 45 and front
mounted intercooler, use about 8 psi boost
- transplant a 13bt, a series 5 should get you there,
but there are numerous modifications to get it to fit
as listed on the sticky on the subject..
The decision is yours and the size of your budget.
- rebuild with a large strretport or bridgeport and
get a high performance carb, such as a Weber IDA
48 plus a good header/exhaust system.
- add a blow through gen 2 turbo with a side draft
carb such as a Weber DCOE 45 and front
mounted intercooler, use about 8 psi boost
- transplant a 13bt, a series 5 should get you there,
but there are numerous modifications to get it to fit
as listed on the sticky on the subject..
The decision is yours and the size of your budget.
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The figure being quoted as 107hp is rwhp, the power at the rear wheels as measured on the dyno. The 100 hp frequently quoted for a stock 12a is flywheel hp, this is then subject to transmission powerloss to get rwhp.
Its more practical to measure rwhp as you dont have to take the engine out and measure power on a test bed.
A 25% gain in hp, however measured, is rather optimistic for just a header.
Its more practical to measure rwhp as you dont have to take the engine out and measure power on a test bed.
A 25% gain in hp, however measured, is rather optimistic for just a header.
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