Using Devcon putty to fill 62t cases

[D-Roc]

i started the tear down on my tired old 701 and noticed a few things that need to be fixed with my motor. One thing i'd like to do when the cases are split is to port them. i can get the devcon putty locally and wondered if it works good to fill it the areas of the cases that need it before i can port. i wanted to use the liquid devcon but it is not offered here. What do you guys think? will the putty squish in to all the areas on the cases or should i look for the liquid stuff elsewhere?

 

[waxhead]

i like to use jb weld
you can heat it and it runs so you know you dont have an air bubble in there

 

[MADMAT]

I have been told by some people that I really trust (Legdrag and others) that porting cases is completely unnecessary. I actually just bought a fresh set of cases because my devcon job only lasted one season and then I started leaking in to my flywheel area again. Everything was coated in goop.

I just don't think it is worth it at all. Just my 2 cents though.

 

[waxhead]

Ok
my experience is otherwise
ported cases are awesome

 

[SuperJETT]

With a putty, you probably won't be able to get it all the way in, and if you port aggressively you'll definitely get into that area and possibly hit some air bubbles.

I'd get some liquid or do the J-B Weld heat trick so you know it's done right the first time.

 

[MADMAT]

Ok
my experience is otherwise
ported cases are awesome

Honestly I noticed NO difference switching from HEAVILY ported to non ported cases. I guess maybe if you are set up for superstock or something .

I would rather build horsepower/performance elsewhere and have perfect cases.

 

[scottie mac]

Ported cases make a HUGE difference IF you have a cylinder set up that can use the extra flow. For example, a Lamey will run 100% better with ported cases compared to non ported cases. And, there is a lot more to setting up cases than just opening them up.

As for the puddy, Devcon makes a two part that you can poor into the cases, works much better than the pubby at filling the voids with zero air pockets. Also, make SURE you sandblast the areas you are planning on epoxying. Simply sanding or grinding the paint away won't hold.

Scott

 

[D-Roc]

JB weld??? really? okay i will look into the liquid stuff that devcon has, that is what i wanted to get but did not se it on the place's website that i would be ordering from. Thanks for the input.

 

[egbrig]

I wonder what you mean by heavily ported, and if the engine didn't respond to good case work then the rest of the engine was not moded that much, or there wasn't any real case work done. Sanding the case surfaces does'nt do a thing, and don't say it takes the imperfections out for better flow. There is a lot more dynamics going on with case mods than just flow. Case mods also work with the pipe, just go and do some reading on the subject. After seeing the liquid Devcon use vs. the putty version I can't believe I ever used the putty.

 

[MADMAT]

By heavily ported I mean they were heavily ported cases. I mean as much as you could I think.

I am not saying their was NO difference. Just nothing very noticable to me or others that rode my ski.

What I am saying is that unless you NEED to do it for Lameys/SS setup or whatever then this is not the way to achieve more power. It leaves holes in your $260-$550 dollar cases that will always need re-epoxied over time.

And if it sneaks up on you I imagine it could destroy (or at least cover it in goop like mine did) a $250.00 stator as well.

Just not worth it to me IMHO.

Then again I am not a racer so.........

 

[Crab]

Anyone ever use setpac epoxy? For anchoring steel into concrete it is stronger than the bolt or allthread. They claim the bolt will shear before the epoxy will let go. It only cost about $15 for a pint caulk gun tube. http://www.simpsonanchors.com/catalog/adhesives/set/index.html

 

[D-Roc]

we have stuff at work that is made by rezi weld for anchoring in reebar to existing concrete. very strong stuff but not sure about what kind of heat it can take. we have used it to pull up large slabs of concrete with cranes and that stuff will hold the anchor in place if the surface has been prepped properly, i am also not sure of its bonding abilities to metals, concrete is pourous and absorbs into the concrete as it cures enabling it to bond as one.

 

[egbrig]

You want to use something that has an thermal expansion rate similar to material it is bonded to and such materials are designed to maximize adhesion to the intended base. Devcon isn't cheap but if applied correctly it does the job. As far as ported cases go like I said if it didn't make a difference then theres not enough engine to warrent it or the case porting wasn't all that.

 

[D-Roc]

so do you guys think that a 83mm ported 61x with 62t cases, single 48 powerbomb, running 185 psi, b-limited pipe, msd enhancer, lighten flywheel, (hopefully delta vforce reeds and atp manifold) motor would benifit from some case porting? i have discovered a leaky front seal so its all coming apart fyi.

 

[MADMAT]

I think it will make a relatively small difference. Nothing major and nothing that I could justify IMHO.

Taking it apart to fix some seals is one thing but porting/epoxing the cases is another.

If you do it let us know what you think before and after.

 

[Matt_E]

It's been my experience that properly ported 62T cases make a noticable power difference and do not need "re-epoxying" on a regular basis.

 

[MADMAT]

I admit I am not the one to ask. I have only epoxied cases once and it did not hold up. I thought welding would really be the best way but I have never seen anyone talk about that in here.

I took the advice of some of the guys in here and bought some used clean cases from m-m marine.

I completely believe it makes a difference on a good motor. It has to. The intake on mine were HUGE and everything was opened up and cleaned up.

I guess its just not for me. I don't trust it.

 

[waxhead]

its really important to make sure that its clean when you put the jb in
i have seen some real bad jobs
i dont like defcon as it tends to shrink and lossen itself

 

[D-Roc]

so you have used jb weld and it holds up over the devcon? Jb weld industrial? or regular

 

[SUPERTUNE]

For one, JB weld works very well! Next in-line for me is Marine-Tex epoxy, more difficult to work with as its a bit stiff. Ported cases make power when done right with the rest of the engine build to suit...All those who build Hi-perf motors know ported cases are a required part of the build.