1NZ port & polish - Page 5 - Toyota Yaris Forums

turboecho2005 · 02-12-2009, 08:33 PM

The 1NZ (and 1ZZ and 2ZZ for that matter) have far to big of a stroke.... you need a more square bore and stroke.

destroke the 1NZ with custom rods and pistons and offset grind on the crank and shave a bit of the top of the block off ;)

Then you can make some serious power but you'll also lose a bit of displacement. But well worth it for the performance gain. But not worth it in the wallet.

ChinoCharles · 02-12-2009, 10:56 PM

I still know this guy, and we still talk about doing it. Went shooting with him last week.

Maybe one day?

jt258 · 05-30-2009, 04:52 PM

SIZE OF INTAKE AND EXHAUST VALVES (STOCK) 30.5MM INTAKE AND 25.5MM EXHAUST.

jouna · 06-01-2009, 06:39 PM

what if we did a whole head job...its only $150 would that gain hp?

02-12-2009, 08:33 PM	#73
turboecho2005 Drives: 2005 Toyota Echo Join Date: Oct 2008 Location: Ottawa, Ontario Posts: 177	The 1NZ (and 1ZZ and 2ZZ for that matter) have far to big of a stroke.... you need a more square bore and stroke. destroke the 1NZ with custom rods and pistons and offset grind on the crank and shave a bit of the top of the block off ;) Then you can make some serious power but you'll also lose a bit of displacement. But well worth it for the performance gain. But not worth it in the wallet. __________________ Project Slowtop - Twin Engine 4AGE Blacktop Vitz - Twin Turbo - 503hp 1987 Nissan Maxima - 40,000 original miles - Slammed 1991 Isuzu Impulse RS AWD Turbo - approx 250hp - Winter Beater 1989 Isuzu Imark RS - Mint Condition - 0 rust - 100% factory :) - Summer Cruiser - 100% restored 1986 VW Jetta Wolfsburg - 120,000km - Mint condition. TDI swap in progress

06-01-2009, 06:39 PM	#76
jouna Drives: jdm yaris sedan Join Date: Feb 2009 Location: bayamon puerto rico Posts: 433	what if we did a whole head job...its only $150 would that gain hp? __________________ vvti bregao!

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02-12-2009, 10:56 PM	#74
ChinoCharles Banned Drives: LB Join Date: Jul 2006 Location: OH Posts: 7,787	I still know this guy, and we still talk about doing it. Went shooting with him last week. Maybe one day?

05-30-2009, 04:52 PM	#75
jt258 View User's Garage Drives: 10' corolla ce Join Date: Oct 2008 Location: HOUSTON Posts: 106	SIZE OF INTAKE AND EXHAUST VALVES (STOCK) 30.5MM INTAKE AND 25.5MM EXHAUST.