D13Y8 mini me comp ratio issues - D-series.org

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Old 03-13-2017, 01:08 AM   #1 (permalink)
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Default D13Y8 mini me comp ratio issues

Hi guys, need some advise on my mini me head swap, the swap is D13B4 stock block with D16Y8 head, I am using VAFC to activate the vtec with a stock non vtec ecu, it runs fine but ths issue is with comp ratio that I found it decreasing from 9.75:1 down to 8.5:1 this is bcoz the head chamber of D16y8 are bigger by 2cc which is 32.80cc to compare from the stock D13B4 head that is 30.80cc, what should I do to restore or add back the comp ratio as the low end feels like shit!high comp pistons or thin metal head gaskets?
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Old 03-13-2017, 09:34 AM   #2 (permalink)
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1. Higher compression pistons
2. Mill the head
3. Thinner headgasket

All depends on how cheap you want to be.
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Can you provide instructions on how to wire all 4 vtec solenoids in parallel? I would like to hit vtec 4 times as hard, but I'm confused as to how the wiring configuration would look. Thanks
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You link all the grounds, then wire each solenoid into the spark plug wires, that way they hit sequentially as the engine fires. This creates what I like to call asphalt shattering VTEC.
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Old 03-14-2017, 10:35 AM   #3 (permalink)
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Quote:
Originally Posted by rico58204 View Post
1. Higher compression pistons
2. Mill the head
3. Thinner headgasket

All depends on how cheap you want to be.
I don't think that's going to get him back to 9.75. With p29's, a y8 mls, and .030 off the head he's still not into the 8's. According to the zeal at least.
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Old 03-16-2017, 10:55 AM   #4 (permalink)
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I decided to just throw this bloody d13b4 block n replace it with d16a7 block which I can get it for like $120, see if it makes a different on the CR
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Old 03-16-2017, 11:33 AM   #5 (permalink)
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Yeah, that would be a better choice. I think you're the same guy I talked to on facebook about this. You said you had p08 pistons right? Well now you'll be approx 8.5:1. BUT, you could ditch those pistons for one of honda's other alternatives and get you pretty much whatever c/r you wanted, so long as the piston to valve/deck height is compatible. p29's will put you at 12.6:1. Not sure of the fuel quality where you're from though so that might not be wise on pump gas.
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