AFR 185's

Phantom5oh · 02-04-2003, 09:40 PM

I'm planning on supercharging my little 306 this summer. Right now I have a set of Windsor Jrs. on it, but I'm thinking of replacing them with a set of AFR 185's. What will I need to do to put on the AFR 185s? I have forged TRW Flat top pistons (notched).

ex-lt1-guy · 02-04-2003, 09:46 PM

what compression ratio are u going to yield with the combustion camber difference between the 2 heads? the notches will help for valve clearance, i believe the afr 185 is a 60 cc if im not mistaken, u have to watch the compression ratio with a blower if you are closer to 10.1 compression, then u have to have an intercooler

Phantom5oh · 02-05-2003, 08:35 AM

How can I calculate compression ratio? I'm pretty sure I'm around 10:1 now with the Windsor Jrs 58cc combustion chamber. The AFR 185s come 3 different ways:

185cc Street Head, Stud mount rockers, 58cc chambers;
185cc Street Head, Pedestal mount rockers, 60cc chambers;
185cc Street Heads, Stud mount rockers, 61cc chambers

I would either get the 60cc or the 61cc chamber version. Depending on where it will put my compression ratio. Another question is which rocker mounting style is better?

ex-lt1-guy · 02-05-2003, 06:39 PM

stud mount is a good setup, pedistals i believe u have to shim up to get the correct geometry, the compression ratio will vary, depends on the piston you are using, but the head chamber size will raise or lower your compression ratio, say u are running a stock piston and head, which i believe is 9.0:1 compression with flattops, if you run a dome piston with the same head your ratio could be 10.2:1, depends on the spec the piston manufacturer gives with certain chamber heads, look it up in summit or jegs, you'll see the different ratios with the chamber sizes....

02-04-2003, 09:40 PM	#1
Phantom5oh Registered Member Join Date: Mar 2000 Location: Boston, MA Posts: 334	AFR 185's I'm planning on supercharging my little 306 this summer. Right now I have a set of Windsor Jrs. on it, but I'm thinking of replacing them with a set of AFR 185's. What will I need to do to put on the AFR 185s? I have forged TRW Flat top pistons (notched). __________________ 95 GTS 03 DR 650SE Sgarzi's Machine Works

02-05-2003, 08:35 AM	#3
Phantom5oh Registered Member Join Date: Mar 2000 Location: Boston, MA Posts: 334	How can I calculate compression ratio? I'm pretty sure I'm around 10:1 now with the Windsor Jrs 58cc combustion chamber. The AFR 185s come 3 different ways: 185cc Street Head, Stud mount rockers, 58cc chambers; 185cc Street Head, Pedestal mount rockers, 60cc chambers; 185cc Street Heads, Stud mount rockers, 61cc chambers I would either get the 60cc or the 61cc chamber version. Depending on where it will put my compression ratio. Another question is which rocker mounting style is better? __________________ 95 GTS 03 DR 650SE Sgarzi's Machine Works

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
185's or Vic. Jr.'s	fiveOguy20	Windsor Power	1	04-02-2004 07:57 AM
AFR 185's w/E-303: Piston to valve clearance problems?	yelowjaket	Windsor Power	9	04-01-2003 07:50 PM
thinking about buy a used set of afr 185's...please read	dragstang86	Windsor Power	9	12-07-2002 01:38 AM
Stock Cam- AFR 185's	pac663	Windsor Power	4	10-05-2001 05:05 PM
If you have run AFR 185's WITHOUT flycutting stock pistons, come in!	jmx2	Windsor Power	2	09-01-2001 10:06 PM

02-04-2003, 09:46 PM	#2
ex-lt1-guy Registered Member Join Date: Dec 2001 Location: O'Fallon IL Posts: 93	what compression ratio are u going to yield with the combustion camber difference between the 2 heads? the notches will help for valve clearance, i believe the afr 185 is a 60 cc if im not mistaken, u have to watch the compression ratio with a blower if you are closer to 10.1 compression, then u have to have an intercooler

02-05-2003, 06:39 PM	#4
ex-lt1-guy Registered Member Join Date: Dec 2001 Location: O'Fallon IL Posts: 93	stud mount is a good setup, pedistals i believe u have to shim up to get the correct geometry, the compression ratio will vary, depends on the piston you are using, but the head chamber size will raise or lower your compression ratio, say u are running a stock piston and head, which i believe is 9.0:1 compression with flattops, if you run a dome piston with the same head your ratio could be 10.2:1, depends on the spec the piston manufacturer gives with certain chamber heads, look it up in summit or jegs, you'll see the different ratios with the chamber sizes....