Type R pistons in 4age/7age 16v

Max2503
Posts: 2
Joined: Wed Dec 31, 2014 1:54 am

Type R pistons in 4age/7age 16v

Postby Max2503 » Tue May 09, 2017 1:20 pm

Can the above Pistons go inside a 16v set-up?

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oldeskewltoy
Club4AG MASTER
Posts: 1615
Joined: Wed Jan 09, 2013 4:44 pm
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Re: Type R pistons in 4age/7age 16v

Postby oldeskewltoy » Tue May 09, 2017 2:22 pm

Max2503 wrote:Can the above Pistons go inside a 16v set-up?


B18C - P72 piston specs: http://www.theoldone.com/articles/pisto ... 2_spec.jpg



What is not there is the volume of the B18C-P72 piston.... (USA B18C1 piston appears to be minus .6cc, while Japanese pistons appears to be +2.5 - http://www.zealautowerks.com/bseries.html)

A 4AGE high comp piston is also 81mm(3.189") diameter, a 4AGE has a taller compression height (30.5mm vs 30.05mm). Crown volume on the USA B18C is a bit smaller then the 4AGE high comp, but larger then the 4AGE low comp. Use of the Japanese version would dramatically increase 4AGE CR to about 11:1 with a stock 4AGE gasket.

What is the wrist pin size? Depending on wrist pin size... you could run the USA type if it fits on the rod, and you machine the top of the block to match the new piston height. I noticed ebay is selling a full set with rings for $170 - http://www.ebay.com/itm/Nippon-Racing-F ... 1232163698
OST Cyl head porting, - viewtopic.php?f=22&t=300

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