First Tank Results CRX HF/DX - Fuelly Forums

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Old 11-03-2007, 01:52 PM   #1
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First Tank Results CRX HF/DX

First off thanks to all for helping me with my questions to get this thing running. It was a short fill so we'll see. 125 mi 2.6 Gal. Filled to first click on the lowest stop on the fuel nozzle both times same pump 48MPG.

This is with a d15b6 head on a 50K JDM D15B (DX) shortblock. I drove like someone with a new car, revs all over the place, 70 on the freeway. I think with easier drive technique (light hypermile), some low rolling resistance tires, synthetic oil, I'll hit at least 55 mpg.

For the record this is not a unique engine. The 92-5 CX had the same head PM8 on the DX block.
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Old 11-03-2007, 01:58 PM   #2
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Looks pretty good so far, you should be able to get those numbers up no problem.
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Old 11-04-2007, 01:31 AM   #3
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So the valve reliefs on the pistons are not a problem? I would think that running an 8 valve head on a bottom end with valve reliefs for a 16 valve head is going to cause some piston/valve issues.
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Old 11-04-2007, 02:31 AM   #4
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So the valve reliefs on the pistons are not a problem? I would think that running an 8 valve head on a bottom end with valve reliefs for a 16 valve head is going to cause some piston/valve issues.
I'm pretty certain that the CX's pistons also had four valve reliefs. Perhaps honda's way of saving money?
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Old 11-04-2007, 07:10 AM   #5
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I'm pretty certain that the CX's pistons also had four valve reliefs. Perhaps honda's way of saving money?
It did. It was!
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Old 11-04-2007, 10:05 AM   #6
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Had both bottom ends sitting side by side. Everything about them was the same except for the two extra reliefs. Since, as I understand it, the piston parts are unavailable at this point, using a DX block is pretty much the only choice available if the pistons are shot
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