would yall trust ebay engine internal parts?

 

Are we talking new or used parts? Who is the vendor?

For used parts, anything mechanical that is used is a gamble.

For new parts, check the seller's feedback and how long they've been selling to see how satisified customers have been.

 

I bought my SCAT 4340 crank over Ebay and had it checked at the machine shop before I installed it and it was perfect! they said it was very balanced and didn't require that much more to get it perfectly balanced. You really have to look at their feedback though!

 

it really depends on who you buy stuff from, ive had really good expereinces with CNC motorsports.


but i have bought over 1k in engine internals including

eagle crank
RHS heads
Comp cam
Lifters
Rockerarms
pushrods
and eveything is brand new and balanced and perfect

 

I also delt with Cnc-motorsports on ebay and off his site, clint is a great guy to work with and has some great deals.
my eagle crank rods, pistons rings and flex plate are from him plus a few other things.
Nathan

 

it really depends who you buy from, wether the part is new or used, and whay brand the part is.

 

Never buy used internals always buy new! Ebay is a great place to find new parts from real parts dealers all of the U.S. But do yourself a favor if your going to buy internals make sure they say they are all ready balanced!

 

Another major thanks to CNC Motorsports, I got 1.6 roller rockers from them and they were amazing. They're actually CNC'd rockers I was impressed; about 1000 miles on my motor so far with no issues whatsoever.

 

I was looking at some used pistons that the guy said were sent to the machine shop and cleaned and rebuilt

first of all how do you rebuild a piston and second of all the closeup picture of the piston showed the wire brush marks on the head of the piston.

I guess some to the people would go for a set of pistons and rods for 40 bucks but you have to be careful

 

I also got my Scat crank from CNC Motorsports, good deal everything was perfect. I second not buying used internals from ebay-even if you get them for cheap, shipping and possible repair costs will kill you. However, you can score on new parts from reputable vendors on ebay.

 

I bought an 081 head because I ported through a water jacket

I also knew what I was in for and expected to have to overhaul it completely.

it is not a good idea to buy a part like a block or a head or a crank without going into it with the idea that it will spend some time in the machine shop or worse have a crack in it and become a wheel stop

 

Buying used parts is a gamble anywhere, ebay is no different.

For new parts it can be hit or miss - Do you know EXACTLY what you need? If you already have part numbers and just need a price then ebay is fine. If you need questions answered, an odd combo or special order part I would highly recommend you actually speak with someone.

Ebay is a listing service not a tech source, buyer beware if you don't know what you're buying.

As for balancing you'll get what you pay for most of the time... Do you want a stock type balance or do you want a precision race balance?

If a couple grams of variance on each component and a few grams of total variance is 'close enough' for your build then a standard balance is fine. The kits we order pre-balanced from Eagle, and the VAST majority of kits you'll find on ebay are all done in that manner. They take a set of rods and a piston, take 1 of each of their weights and balance the crank to that bobweight. The factory variance between pistons, pins and rods is the 'accepted' variance in their balance. Different shops have different tolerances but most stock type balances are ~5g as 'acceptable' on the crank.

If you spec a full balance, and generally more expensive, the shop is going to weight match the rods to eachother and then the piston and pin assemblies to eachother. This eliminates the variance in weights between parts. They then balance the crankshaft to this exact bobweight, generally within 1g or .5g, depending on the shop.

Persoanlly I'd rather do my own balances but if you want cheap, and generally "good enough", then a pre-balanced assembly might be for you.

$.02

Brian
www.adperformance.com