Engine Proformace (10:1 compression)

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Apr 12, 2009 | 04:59 PM

#11

Billytoppless

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From: Stuart Fl

Quote:

Originally Posted by jtmon75

billytopless, my 75 sporty is stroked and bored 30 over,all s&s with andrews cams.it has tons of torque and it will grab 120 mph really fast.s&s recommends a minimum of .060 valve to piston clearance but they say .080 is better.by the way my bike is very streetable and dependable.you might have to install compression relief valves in the heads.

do i need to install them for 10:1?
whats your com. ratio and wut size cams do you have?

Apr 12, 2009 | 05:02 PM

#12

Billytoppless

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From: Stuart Fl

Quote:

Originally Posted by shepdog

the only thing i can think of is maybe the spring pockets (to clear the guides or pockets) for higher lift cams i run andrews r5 cams also had it over 115mph also!

i have no idea wut spring pockets are lol

Apr 12, 2009 | 05:41 PM

#13

IronMick

Stellar HDF Member

Joined: Jun 2008

Posts: 3,179

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From: London, ON Canada

Quote:

Originally Posted by Billytoppless

i have no idea wut spring pockets are lol

I think he might be referring to the "pockets" in the top of the pistons for the valves?

Apr 12, 2009 | 06:45 PM

#14

shepdog

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From: se ohio

i was talking about where the spring sits in the head not sure what else could need work in the head sometimes (on other types of motors) you cut the heads to get correct spring height