The Ford Barn

Hotrodfil · 01-23-2018, 05:44 PM

A question on valve spring pressures for a new Stipe B340 cam.

History...

I have a reground cam in the diamond B in my Fordor, modern valves, new (10 years ago...) stock springs, with pressed in guides. Few other tricks, but it's still pulling at 85mph on the sat nav with no sign of valve float - I make that about 3300 with the gearing and tyre size.

The Tourer has the same grind on the cam with 1.7" inlets, and the stepped push in guides that Snyders sell, with stock springs. I've taken it to 3300 rpm on the rolling road where the power starts dropping off.

So - I'm putting together a new B engine with a Stipe B340 cam, 1.7" inlets, and the Snyder type guides. Will the stock valve springs suit, or do I need something with a little higher pressure? I don't want to knock the cam or seats out for the hell of it, and so far I've had no noticeable valve float with my previous ground cams? Or have I and I couldn't hear it above the wind noise...?

01-23-2018, 05:44 PM	#1
Hotrodfil Senior Member Join Date: May 2010 Location: Norfolk UK Posts: 214	Valve spring pressure and a Stipe cam A question on valve spring pressures for a new Stipe B340 cam. History... I have a reground cam in the diamond B in my Fordor, modern valves, new (10 years ago...) stock springs, with pressed in guides. Few other tricks, but it's still pulling at 85mph on the sat nav with no sign of valve float - I make that about 3300 with the gearing and tyre size. The Tourer has the same grind on the cam with 1.7" inlets, and the stepped push in guides that Snyders sell, with stock springs. I've taken it to 3300 rpm on the rolling road where the power starts dropping off. So - I'm putting together a new B engine with a Stipe B340 cam, 1.7" inlets, and the Snyder type guides. Will the stock valve springs suit, or do I need something with a little higher pressure? I don't want to knock the cam or seats out for the hell of it, and so far I've had no noticeable valve float with my previous ground cams? Or have I and I couldn't hear it above the wind noise...?