Hi guys, I am about to send my CB 044s out to get milled for 94mm piston Jugs. I am replacing a set that I have up for sell right now and want to know some opinions.

Can you tell me other than having the CB 044's cut for 94mm jugs what else I might do (no port n polish this round).

Check these pics, the one that is black is my CB 044, the one that is not as black (:) ) is one of the heads I am replacing. if you look it seems like the head is more shallow than the CB head... is that simi himi cut? any way thoughts? The heads I took off are nice, run well... I just want to use the CB heads.

The heads are 40 x 35.5 and I run them on a 2175cc motor.

CB 044


Head built to spec (311 or 041 I forget)

Be sure to CC your heads or the compression will be off if both heads don't match. Some heads have a raised groove in the chamber that CAn be fly cut out. It will change your deck height. But other than that I can't think of anything other than port polish check all seats and guides.

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when in doubt use the skinny pedal!

Just sent the CB 044's to Brothers Machine in CA... I am only asking for them to be opened up for 94mm jugs... CB performance already does a lot of work to the heads (no port and polish though)... I will hold on that, I think later in the year or next spring I will swap my 35.5 to a 37 to see how that works in my 2175... I am prety sure the other heads are simi himi cut, at least they look it... not going to get these done the same way...

the other heads were probably cut to raise the compression..i would think not havin the O44s cut the same would lower it, hurting you instead of helping IMO..i think an O44 has a 56cc chamber (correct me if im wrong) i would CC the old ones jus to see were they are at..

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LEGALIZE BLUEGRASS!!!

Save a tree... eat a Beaver

X2 cc the old heads . so you can make the 044 same cc . I would send heads to one of the sponsors like Drews or some one close to you .

i have had good luck with brothers...sent my block out there to have lifter bores sleeved they are a good bunch of guys

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Hey,can you hand me those zip ties and that roll of duct tape?!

hmmm, I have no way to cc the heads... the other ones are in the mail... Worth sending pics to them for a visual? No one near me for anything like that... I will be running 40mm dual carbs with them (same as with the other heads)... I guess worst case I can have them fly cut when I send them back for re valve next spring (will be bumping up the valvs to 42 / 37 for my 2175... I hear its a good idea... but dont have the cash this time around... I could have just stuck with my other heads I guess... these are just cleaner is all.

thoughts?

brothers can CC the 044s..i did my heads with piece of plastic cut to fit snug inside the head. drill a hole in the middle and press it in until it hits the chamber, then jus use a syringe that measures CCs with rubbing alcohol in it...when it is level with the hole u have your CCs

i think a CB 044 has a 56cc chamber out of the box

_________________
LEGALIZE BLUEGRASS!!!

Save a tree... eat a Beaver

whats your location, that way maybe somebody on here can recommend a somewhat local shop to at least to get the more simple stuff like flycut and open up for bigger cyl. work done

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Just Stand On It!!!!

Chris

Just tell Brothers what the deck height is and what compression ratio your shooting for and they can figure the rest out. Be sure to tell them if your running copper head gaskets and how thick they are.

I am in southern IN (near Lou)... I may be able to try the cc idea... I will look to see if I have any plastic... I did send a close up pic to Brothers... they may be able to tell at a glance and get it close... to be honest the motor ran well but I was never sure on compression... I have a 78mm crank, my jugs are spaced out with rings to make up for the dif (between jug and case). I was running no shim at the head (between head and jug/piston) just bolted on. Worst case I will be at the 55cc level from CB perf. and I can get them fly cut agn when I switch to 42/37's next spring. I just don’t know the right people anymore to get things done like I used to...

looking for plastic now...
http://www.youtube.com/watch?v=K6c2cg0TFkU

Wondering, cant I just tell Brothers what I run and get them to use best judgement?

2175cc
40 mm dual empi carbs
110 cam
78mm crank
94mm piston

I just ordered a cc kit... this will help. Now to be clear... the heads were on my motor before but they were as is when I bought them (meaning I never had the work done) should I assume I need to keep as is)? I will report back with volume size once I have done the test.

This is the CB Pef. Calc. (note 55 is what they say the heads come as... I read that they can be taken to 57 with little effort). I measured with a caliper and I get about 2mm its close, I need something to tighten the cylinder to the case better while I chk... but I say 2mm or a bit less)

What do you guys think?

What kind of gas do you want to run pump gas 93 or race gas 112 or 50\50 around 102 octane . Cheek your deck height aka piston to top of cylinder and till them what gas you want to run and they will cut the head for the wright compression .

You got it . i was to slow

I did best I could with what I have to use and I think the DH is at or close to 2mm this is why I chose 1.95. I will run high octane pump gas for the most part just because it’s easy to get...

CC your old heads so you no what you had for compression so you can go up or down for the gas .

Shops south of INDY. new is Brians off road 317-840-7507. and Davis motorsports 765-763-7709

i run the same motor (78x94, 110, 40x35.5 valves and dual dellorto 40s) my heads are volkswagon with 2BR numbers on them....i had them cut down to 36cc chambers, ( a lil much and could remove a fin) but i run a 60 thousands copper gasket with no shims between jug and case and that got my compression to 11:1 i have always ran that motor but before the tear down it was a single carb and 9:1..the difference was nite and day, apples and oranges..

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LEGALIZE BLUEGRASS!!!

Save a tree... eat a Beaver

thanks for the shop numbers... I could not locate anything... cost me 50 bucks one way to ship my heads (will be another 50 back... plus labor) not cheap.

You need to tighten that deck up some! Get it down to around .045" or .050" and the motor will run better, run cooler and be more forgiving on running pump gas. You can get away with 9.5:1 on pump gas with a well tuned set up.

While I am waiting for the cc tool to show up... I was thinking about what you said. If I wand to get more compression I am going to need to decrease my DH... Usually that is not so bad but the builder used some crazy sealant I have never seen before and I am not able to get the jugs off to reshim so I might be stuck at 1.95mm DH. I will try to re measure agn in a while but I think it's close to 2mm now. I would get out my rubber hammer but I am afraid I will break some fins... One edge is already broken.

Thoughts?

If you think it's the right best way to get this thing setup... I will get some solvent remover and a putty knife and a razor blade and go to town, I just want to be sure... If I was replacing the jugs, I would just rip them off... But they have less than 300 miles on them... And are new... Don't need a reason to replace. Not sure what he used for sealant but it's hardcore....

I am with Aaron .040 to .050 Deck and 9.5 to1 for 93 gas well tuned eng. around 32 deg. timeing . But i would not brack the jugs to do it . If you have .080 it will be ok just make it 9 to 1 .

OK, I was able to get the cylinders off... once I broke the seal it was not that bad... whatever they used almost feels like plastic... Do you guys re use the shims once you take them off... mine bent some on removal due to the sealant... but I would guess they will flatten out once bolted back on.

I have 3mm shims (2x1.5) which in turn gave me the 2mm DH. so if I remove one I will have approx. 1mm DH... should I stick to that, or shoot for .50 (guessing a .75 spacer) but I only see .90 (but can do a 60 and a 20 for 80).

It’s going to take me a long while to remove all the old sealant from the case and jugs it’s a mess, and really hard to get off. so this week while the heads are out to Brothers... I will get it clean and get the DH where it needs to be.

So questions for now:
1. 1mm ok or no? if OK reuse shim or no?
2. what the heck can I use to clean the sealant off with... I don’t think anything will make it easy.
3. what octane should I shoot for (running pump gas only because it’s easy to find) 9.5.1 - 10.1

Also I got the CC kit in the mail today... I will cc the old heads just to know what it was... but at this point I don’t think it matters... Brothers said they will cc each one and let me know what exactly they are... so I can make it what I want, however they did say 9.5.1 should be good??

Thanks for helping guys... been a while, but I do love working on these motors.

Now if I could just get my old parts out of my garage so I can get more room to work...

.040 is good . To be safe set it up for .045 . I yous hi heat RTV on jugs . 9.5 to 1 and 93 gas. I will re use the shim if in good shape

If I reuse the shim I will get 1mm DH (with a 78mm crank) so if you are telling me to shoot for .45 I need to like half that I think (depending on what brothers comes back with on the CC for the heads).

if the heads come back at 56 (per the site) in order for me to get .9.5 to 1 I would need 1.1mm DH or just the same 1mm DH gets me 9.6 CR

Thoughts?

9.5



9.6