doo0T!doo0T!

I've searched high and low and cant seem to find any solid info on the F18b crank (or one to measure).
I know the stroke is 81.5mm and the deck height is supposedly the same as all the other H/F varients but can anyone confirm the following?

Rod Length: If F20b is 145mm and stroke is 88mm it would be a good guess to say the F18b rods should be longer by half the stroke difference right? So 88 - 81.5 = 148.25mm

Main bearing Journals:
50mm or 55mm?

Block:
Same style as F20b/F22a with the normal H22a style crank girdle or F23a style with the big beefy girdle?

They're 85mm bore and use the same piston ring set as F20b/F22a so chances are it's the former.


The reason is I'm making a G23 style hybrid with a mix of H/F&K parts but I want to use F18b crank and rods to destroke rather then stroke so I can race in a sub-2litre class.
If the F18b crank is 50mm mains it wont fit the 55mm F23 block I want to use.

I have an F20b crank I can use but with the 86mm bores that puts me 44cc over the capacity limit.

If the F18b block has the big bad girdle like the F23 then I'll just use that block.

Thanks in advance

GlassJAw

I got some information if you want it Mike, I have a Honda ESM manual that has some of the dimensions / information youre looking for in it.

F18B2 & F18B3 Main Bearing Journals are 55mm, Rod Journals are 45mm (48mm at the rod's b/end), Bore & Stroke = 85.0 x 81.5mm, Compression ratio is 10.0:1, Displacement is 1,850cm3

Funnily enough they also do a F20B6 which is a SOHC Vtec engine, Main Bearing Journals are 55mm, Rod Journals are 45mm (48mm at the rod's b/end), Bore Stroke = 85.0 x 88.0, Compression ratio is 10.0:1, Displacement is 1,997cm3

Unfortunately I dont have any Specs on the F20B DOHC Vtec

But I Hope this helps somewhat.....

kd97accord

From Wikipedia "Honda F Engine"

F20B

This engine series was used in the CF4, CF5, CF9, CL3 Honda Accord and Honda Torneo from Japan. It uses a DOHC VTEC cylinder head similar to the H22A found in the Prelude but was designed to comply with many countries' sub-2.0 liter tax. The automatic transmission versions received the lower hp version (180 hp), as it was tuned for more mid-range torque than its manual transmission counterpart.

Specifications

* Accord SiR wagon, SiR-T F20B 97-01 2.0L
* Valve train: 4 Cylinder, DOHC VTEC, 16 Valve
* Bore: 85.0 mm
* Stroke: 88.0 mm
* Displacement: 1997 cc
* Torque: 145 ft·lbf (197 N·m) @ 5500 rpm
* Horsepower: 197 hp (147 kW) @ 7000 rpm
* Red Line: 7600 rpm
* Compression: 11.0:1
* Fuel Control: OBD-2

doo0T!doo0T!

Brilliant, thats the best news I've had today. It's looking like it'll be a straight fit onto my F23a block. That short stroke combined with the F23a girdle and K20a compression should make for a pretty high revving combination!

Thanks man, yeah I've got the info on the DOHC F20b, I have one going into my crx at the moment. It's the F18 I was really interested in for it's short stroke.

CIVIC30

ARE F20B AND H22A VALVE SEALS THE SAME?