High Comp 120cc Build

[dave brode]

Got to think backward.

Block right side up, stock holes are at apx 5 and 7.

Assuming the shop put the special bearings in with one hole lined up w/the stock drilling [ :banghead: ], the extra holes will be at either 11 or 1. Much better than 5 and 7.

The shop should have known enough to put the bearings in to give ideal oiling, but they did not.

Dave

 

[samIam]

Spring seat to top of valve guide is .727 and the spring boss is .851. I'll take a look at the cam bearings in a little bit.

 

[The Mad Cadder]

Spring seat to top of valve guide is .727 and the spring boss is .851. I'll take a look at the cam bearings in a little bit.

You need to know the distance between the bottom of the retainer
and top of guide with seal installeld .

Ideally it should be .06 more than max lift .. But I have run less ..

Second is installed spring height ..spring seat to seat for spring on retainer

 

[dave brode]

Spring seat to top of valve guide is .727 and the spring boss is .851. I'll take a look at the cam bearings in a little bit.

You need to know the distance between the bottom of the retainer
and top of guide with seal installeld .

Ideally it should be .06 more than max lift .. But I have run less ..

Second is installed spring height ..spring seat to seat for spring on retainer

I'll add that you MUST be measuring with the retainer and esp locks you will run. [as in std or minus locks].
Dave

 

[samIam]

Alright, thanks. I'm having a hard time making out what yall are saying about the cam bearings. The bearings are back grooved with holes 90 degrees apart. The feed holes line up with the feed holes on the block which puts them at 11/5 and 1/7. Should they be at a different position?

 

[samIam]

Yellow dots represent current line up with other hole 180 from..

 

[The Mad Cadder]

The bearings are back grooved with holes 90 degrees apart. The feed holes line up with the feed holes on the block which puts them at 11/5 and 1/7.

That is actually how Cadco recommends them to be installed..
Lined up with factory feed holes extra oil enters at other hole..

It would definitley be better if they were at 2-3 "IF" they were single hole and
backgrooved bearings

.not so sure with 2 holes..

 

[dave brode]

http://www.dura-bondbearing.com/Portals ... lletin.pdf

I see no need for the extra hole. I would put them in at 2. I used CadCo brgs once, I put them in at 2 and 8.

That said, what you have is far better than a stock setup.

Dave

 

[Member 3508]

Sam, i have them (cadco's) installed the same as you. Dont sweat it. Move forward.

 

[Yendor]

No one else has, so I will comment on the quality of that picture.
If there were a competition for such things, that would have to be in contention.

It's easy to take bad pictures and difficult at times to do otherwise. You nailed that one.

 

[The Mad Cadder]

No one else has, so I will comment on the quality of that picture.
If there were a competition for such things, that would have to be in contention.

It's easy to take bad pictures and difficult at times to do otherwise. You nailed that one.

 

[Darius]

No one else has, so I will comment on the quality of that picture.
If there were a competition for such things, that would have to be in contention.

It's easy to take bad pictures and difficult at times to do otherwise. You nailed that one.

Double Ditto on what Yendor said!

On page one of this thread I noted: "The excellent picture quality helps to tell the story. Thanks for taking care to provide them. Very nice work overall!"

Keep on keeping on with the excellent quality of your pictures. Dang, I've never seen cam bearing oil holes portrayed better anywhere!

d

 

[samIam]

Thank you everybody for the compliments. I did a little photography many years ago but this one goes to the machine shop, they marked the holes as a quick reference.

I'm gonna leave the bearings as is since I've got the worked oil pump and the balancing line. I'll take a look at the main bearings now.

 

[samIam]

A power adder has been popping in and out of my mind for a few months now, how much affect would that have on cam selection? More then likely it would be a little spray unless I find the money for turbo. Wouldn't be an all out amount but enough to make it worth it. Just enough to be number one on street outlaws! Lol

 

[Member 3508]

Spray is your only option. Your compression is too high for super out turbo.

 

[The Mad Cadder]

Spray is your only option. Your compression is too high for super out turbo.

His compression at current chamber volume is only 9.5...
And of course there is always race gas :cloud9: or a mix of both

I do think turbo is the way to go.. never been a fan of nitrous..
And again a big cam will alow more static compression

For spray I would want 11.5 - 12 ..but that is just me... :bolt:

The cam I prescribed would love a turbo

 

[8ad-f85]

E85 will let you pile on some boost.

 

[samIam]

So I could build the motor as planned and add turbo later?

 

[8ad-f85]

yes, except for ring gap and bore clearance.
Much more needed on the ring gap and only a little looser on the bore.
I've used some pretty wide gaps and never have seen extra oil usage, FYI.

 

[samIam]

Sounds like it'd have to come apart again or can I set it up for turbo now? Even if it's unknown if turbo/spray will actually make it on the car?