Hp with 12.1

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Hp with 12.1

Post  larry552 on August 7th 2015, 9:04 pm

What kinda of horsepower can I expect with 12.1 compression. Here is the combo. 4.3 stroke bme aluminum rods flattop diamond nos pistons. A460 340 83 cc heads with some port work. Just curious to know what kinda horsepower to see when I put it on the dyno.
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Re: Hp with 12.1

Post  kim on August 7th 2015, 9:36 pm

Whats the cylinder bore?  A460 heads like the bigger 4.625 bore. Stock block, figure 370 cfm, with minor port work, 750hp.

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Re: Hp with 12.1

Post  larry552 on August 7th 2015, 9:51 pm

4.640 bore
Cam is 865 int 841 ex on a 114 285 304@. 050
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Re: Hp with 12.1

Post  butterbean on August 7th 2015, 10:16 pm

Larry, that thing will make more than 850 on HP alone easy and it may make more but I know you are building it for spray so it will come alive when you smack it for sure!!!!!
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Re: Hp with 12.1

Post  larry552 on August 7th 2015, 10:44 pm

Yes sir I have 350 in it at the moment to start and the I will work my way up to the 500 shot. I wanna try and get in the 4s
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Re: Hp with 12.1

Post  butterbean on August 7th 2015, 11:09 pm

should be no problem, it should run 5.60-5.50 on HP and with a 350 shot it should run 5.10-5.00's, let see what happens
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Re: Hp with 12.1

Post  kim on August 7th 2015, 11:33 pm

Big bore, decent can, maybe a little more work on the heads than your letting on.  Low 900s with a little tuning.

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Re: Hp with 12.1

Post  Lem Evans on August 7th 2015, 11:49 pm

Why only 12/1 ?

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Re: Hp with 12.1

Post  larry552 on August 8th 2015, 8:00 am

The heads have had some port work done but not a whole lot is what my head porter said I will post some pics of my heads.
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Re: Hp with 12.1

Post  larry552 on August 8th 2015, 8:02 am

Lem that's the same question I have why only 12.1. But that's what my engine Builder said it was. When I did my diamond pistons caculator I came up with 13.1 so I don't know if I'm putting something in there incorrectly
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Re: Hp with 12.1

Post  larry552 on August 8th 2015, 8:06 am





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Re: Hp with 12.1

Post  larry552 on August 8th 2015, 8:11 am

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Re: Hp with 12.1

Post  larry552 on August 8th 2015, 8:36 am

INT was flowed with a smaller bore than engine bore of 4.640
.100 70
.200 155
.300 240
.400 310
.500 365
.600 400
.700 425
.800 435
.900 440

EX 2.25 pipe
.100 57
.200 113
.300 159
.400 202
.500 243
.600 276
.700 301
.800 321
.900 352
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Re: Hp with 12.1

Post  IDT-572 on August 10th 2015, 3:07 pm

I would think between 975 and 1000 hp.
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Re: Hp with 12.1

Post  larry552 on August 10th 2015, 3:52 pm

That will be music to my ears. We wI'll see as soon as it get built I'm going to put it on the dyno
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Re: Hp with 12.1

Post  bbf-falcon on August 10th 2015, 5:10 pm

IDT-572 wrote:I would think between 975 and 1000 hp.

X2 w/single 1250+Very Happy

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