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Old 06-28-2019, 08:24 AM   #1 (permalink)
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Default D16a6 engine build need help

I have a 1990 crx si with the original d16a6. I wont to build the original motor. The head has had a value job and has been shaved. Machine shop has stated that the block needs to be bored out at least .10000. What is the best bore to go with being I have to bore it? And what pistons and rods are recommend? Trying to have a 250+ hp daily driver. Will be boosting but I want the motor right first. Car hasn't been on the road in 15 years.
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Old 06-29-2019, 05:01 AM   #2 (permalink)
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I'm thinking 20 over on the Block bore. And Vitara pistons and rods any ideas?
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Old 06-29-2019, 09:29 AM   #3 (permalink)
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Thinking about this setup anyone know how they are?
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Old 06-29-2019, 02:55 PM   #4 (permalink)
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vitaras are great for cheap durability, but suck donkey balls for actual performance.


Are you looking for a setup that feels healthy everywhere, or are you worried only to have an actual 250+ hp?

More importantly, are you looking to daily drive this?

Because if so, you should budget 2-5x more money towards brakes, tires, suspension bushings, and either coilovers or a good spring and strut combo.


All new bushings everywhere alone makes a HUGE difference on all generations of the civics and crx's
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Old 07-01-2019, 05:55 PM   #5 (permalink)
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Looking for a bottom end setup. .10 over setup blew head gasket 15 years ago.
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Old 07-02-2019, 04:04 PM   #6 (permalink)
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Well, I found you a Nippon-Racing version of the Vitara pistons and a set of Eagle "H-beam" rods.

Kit says 8.5:1 compression, but they dont say WHICH D series head was used.

$525

https://www.ebay.com/itm/HONDA-CIVIC...EAAOSw5cNYi9X3


That is about the lowest compression that still maintains some drivability and keeps the turbo easier to spin up.


They say the kit has done 350hp+, but Im pretty sure people have gotten the Nippon versions of the pistons beyond 450 or 500 hp

The H beam eagle rods are plenty strong and easily support 400+hp
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Old 07-04-2019, 06:02 PM   #7 (permalink)
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Thanks guys. Am going to check on these things. And report back. Will be painting motor bay this weekend.
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Old 07-05-2019, 12:58 AM   #8 (permalink)
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have you heard of the y49 curse?
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Old 07-05-2019, 03:38 AM   #9 (permalink)
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have you heard of the y49 curse?
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Old 07-05-2019, 11:46 AM   #10 (permalink)
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Lol yes I have heard of it. It will be getting fresh coat of orange paint soon.
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Old 07-07-2019, 03:41 AM   #11 (permalink)
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Engine bay, done for now. Time to order parts.
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Old 07-07-2019, 06:58 AM   #12 (permalink)
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Quote:
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have you heard of the y49 curse?
there is a yellow crx just down the road from me ,it has recently been kerslammed by these forces of evil as well ...
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Old 07-10-2019, 02:31 PM   #13 (permalink)
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I'll be running stock si wheels myself. This is before I pulled the motor. Motor will be done tomorrow or at least at first machine shop. Time to find a good set of over sized piston. 10 or 20 thousandths.
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Old 07-10-2019, 05:30 PM   #14 (permalink)
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p.s car looks good
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Old 07-11-2019, 12:35 PM   #15 (permalink)
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p.s car looks good

GM did it in the 70's so why can't I..?






Low comp ,not vitara's...

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Old 07-11-2019, 01:59 PM   #16 (permalink)
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GM did it in the 70's so why can't I..?
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Old 07-11-2019, 02:29 PM   #17 (permalink)
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Lol definitely not going with the vitara setup got a lot of bad reviews here. Am trying to keep my piston and rods around or under $600 if possible
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Old 07-11-2019, 03:02 PM   #18 (permalink)
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I have used vitara's in many builds with std rods and long rods ,

In the rat mobile I had the td04hl15 wastegate set on nog for 20k but I must have been making less power than a 10:1 10psi build... :eyeroll:
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Old 07-12-2019, 01:35 PM   #19 (permalink)
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Those charts are misleading.

If you tune it correctly then there’s no reason for low compression. At some point, when your dynamic compression ratio gets high enough, you’ll reach the knock limit of the fuel and will either need higher octane fuel, reduced timing, or a lower dynamic compression ratio to avoid detonation.
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Old 07-12-2019, 02:52 PM   #20 (permalink)
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Those charts are misleading.
yeah I know and also based off of heat soaked roots style sc.
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