General Category > General Discussion
Worst Case Scenario - Chrome Cylinders?
RayB:
In case you want to lower P and eliminate the risk of popping the chrome, you could opt to have the cylinders replated with Nikasil by this place in Fondulac as an alternative to replacement
http://www.finishing.com/shops/uschromewi.shtml
I would inspect those cylinders before you make any decisions - good time of the year to look and know where you stand
RayB:
BTW, If you could get a good used engine for $1000 ( best case ) with upgraded cylinders then anything greater 80% probability of failure of the existing cylinders and you are on the losing end of the equation vs replacing them before they flake. At some point in time the P will reach 80% - the question is when not if. P is a function of time and conditions. Its a known fault of the design.
Like Chuck said I wouldn't take the risk.
LonerDave:
So we know that P is not 1.0, at least not after 39 years (bobdar). And that we can get a better idea of P by having a look (acogoff).
We also know that C probably won't exceed about $2,000 (using Father, Chuck and ATE's advice about whole new motor - saw a used 850 motor on eBay for $1,200, plus new Gilardonis for $800). Perhaps significantly lower if one with iron jugs can be found, making Gilardonis unnecessary.
So worst case, not doing anything makes financial sense only if P<.4 [$800 = .4($2,000)]. RayB's last post suggested that it won't be that low forever.
C could be further reduced, and P lowered to close to 0.0 by replating now (RayB). I've requested a quote from US Chrome.
Thanks everyone. Sorry to drag you into the tortured mess that is my thinking process. This is precisely why my wife won't let me do the grocery shopping.
RayB:
The thing is you'll never know what the P will be for your machine until it fails
Spend $800 now or spend more later. You may have over-complicatred the decision process a bit.
I would bet the prob of failure increases at a rapid rate as time goes on and its not a constant (corrosion rate of substrate). The equation you used would be ok for figuring a premium for insurance if you had actuary data but it wouldn't work here as 2 data points aren't good enough and the rest of us are guessing
Let us know how you finally go
Matt Story:
As a preventative repair, if your cylinders and pistons are in fair to good cobdition, having your cylinders Nikasil'd before they go bad costs a bit over $400. Add to that a new set of rings.
Thats $400 if the cylinders are close to factory dimension. Price goes up if they are not. If hhe chrome is intact, that should be a good ballpark. Had mine done by Milenium
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