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Sonus / or others

fredeuce
Posts: 44
Joined: Mon Feb 29, 2016 10:56 am
Location: South Australia

Re: Sonus / or others

Post by fredeuce » Thu May 02, 2019 11:58 pm

Steve, When discussing this with Dean Tighe he indicated that he built in an offset into the cam lobes knowing it is to be used with a mushroom type tappet.

For any further details I would suggest contacting Dean on 07 3271 6001.

https://tighecams.com.au/

Cheers, Fred

daimlersteve
Posts: 321
Joined: Wed Mar 09, 2016 11:20 am

Re: Sonus / or others

Post by daimlersteve » Sat May 04, 2019 7:57 am

Excellent , great that some engineers think to situation right through . Thats one mean cam. ran out of paper on the lift axis. Have to get a taller sheet to lay it out . If you need to change pushrod lengths the longer ones can be cut back and the ends reused by pressing them back on. I sourced some aircraft alloy for my setup to align with the longer valves. You'll need to shorten the guides somewhat if the heads use seals . What springs are used to cope with the extra lift and loads ? Beehive , conical, twin ? Seated /full lift pressures ?

Great that someone is getting ahead. I'm burning the midnight oil finishing of a six month extension to the house. -- 10.5 x 6.5 mtr. Four car garage and apartment above . all i wanted was the garage space !! Will be back on the project very shortly.

regards Steve

fredeuce
Posts: 44
Joined: Mon Feb 29, 2016 10:56 am
Location: South Australia

Re: Sonus / or others

Post by fredeuce » Sun May 05, 2019 12:18 am

Steve,
This engine when I purchased it never had valve stem seals. Given the application of this engine I will not be fitting them with the new cam. I have milled down the valve guides by .200". This permits overall valve travel of .570" . This is ample for this cam.

As for the springs I will use the springs as fitted. I did speak to the original engine builder and he indicated all of this was upgraded at that time. They appear similar to the Cooper S style springs. They have performed well in the past so will see how it goes.

Focus now is on the lifters and sorting that out.

Cheers,
Fred

daimlersteve
Posts: 321
Joined: Wed Mar 09, 2016 11:20 am

Re: Sonus / or others

Post by daimlersteve » Sun May 05, 2019 7:39 am

G'day across the ditch,
when youve dummied it up just check the inner most section of the spring retainer ( inner spring location ring) against the guide ht. Spring bind ht should be good with those springs . Might pay to check the seated and full lift pressures seeing the cam has some significant lift . 75lb seat / 190 f/lift is enough. They may come up higher as ive set these springs at the above seated and the load at . 390" is around 190 LB.
cheers Steve

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