Engine rebuild

[alpinestars199]

I'm going on 8 gallons soon so I know I'm gona need a rebuild soon do u guys think outing a new piston rod and sleeve assembly in the f4.6 engine from Hpi is worth it or should I try a different engine the rebuild would be 60$ off ebay

 

[Zdragon71]

Hell if you can get all the parts for $60 i would rebuild. Your not gonna get a new mill for that price. If it were a trx engine i would have to say get new engine.

 

[alpinestars199]

I was thinking of buying an lrp 32 engine on eBay but the price to rebuild my stock Hpi engine is outstanding

 

[Zdragon71]

When i looked to rebuild my 3.3 it totaled like $90. So i just spent $20 more and got a .19T instead. I've still got the 3.3 and if i find everything to rebuild it for around $60 i will still do it. But just to have a spare engine.

 

[bifft it]

for $129 from HPi you can trade that in for a complete new engine. new block,new crank,new rod, new piston,new sleeve, new carb, new pullstart

 

[marcobrien]

How long should a Savage X 4.6 engine last before needing a rebuild/replacement (general use, not racing or extreme bashing)?

 

[cwal1774]

Depends on how much you run it. The K4.6 in my old Savage X lasted through 10 gallons of fuel before needing a new piston and sleeve.

 

[MudSlinger33]

Go with the LRP. The LRP .30 will be plenty of muscle for the savage.

 

[joshman1204]

How long should a Savage X 4.6 engine last before needing a rebuild/replacement (general use, not racing or extreme bashing)?

10-12 gallons with a good tune is about what most people get.

---------- Post added at 7:50 PM ---------- Previous post was at 7:48 PM ----------

I was thinking of buying an lrp 32 engine on eBay but the price to rebuild my stock Hpi engine is outstanding

When my 5.9 in my XL finally dies I am going to go with a lrp .32 that I hope to get modded by ERCM.

 

[marcobrien]

How hard/expensive are they to rebuild/replace (for a newbie)?

 

[sv250]

your forgetting $20 for new bearings. Kida silly to change everything but those. That puts you at $80 to repair a $90 engine.

 

[joshman1204]

How hard/expensive are they to rebuild/replace (for a newbie)?

Piston and sleeve are pretty simple but if you decide to do the bearings they can be a little tricky the first time. The bearings are by no means hard they are just a little more involved than just pulling out the piston and sleeve and dropping a new one in.

 

[cwal1774]

your forgetting $20 for new bearings. Kida silly to change everything but those. That puts you at $80 to repair a $90 engine.

Why change the bearings if the old ones are still good? Kinda silly to spend money on parts that aren't needed.

 

[sv250]

Because bearings wear out too and to not change them when doing a complete rebuild doesn't make much sense. Spend all that on the P/S and rod to blow the motor when a front bearing craps out. BTW that engine is known for bad front bearings.

Also spending the extra 20-40$ on the new engine gives you a carb you can sell on ebay for $20 and an extra backplate, starter, headbutton and case.

IMO it only makes sense to rebuild higher end engines. $170 and up range.

 

[2revo1maxx]

8 gallons is a lot for a set of bearings, they may still feel OK, but could let go at any moment. It's not worth re-building an 8 gallon budget engine anyway. You'd need the piston/sleeve set, bearings, and a rod. You may also run into carb issues directly after that.

 

[cwal1774]

I will respectfully disagree with both of you based on the fact that the very same K4.6 i was talking about is still running on the same crank bearings is came out with. It's had about 3 gallons run through it since the rebuild with no issues with the bearings whatsoever.

 

[sv250]

Its a matter of precaution. While your in there, might as well for $20. Sometimes you can find them cheaper. I recently bought a LRP.28. I found a new case with bearings for $25.

Since I was changing the P/S and rod, I think its worth peace of mind. So I'm out approx $115 on my rebuild on a $180 engine.

---------- Post added at 9:01 AM ---------- Previous post was at 9:00 AM ----------

Its a matter of precaution. While your in there, might as well for $20. Sometimes you can find them cheaper. I recently bought a LRP.28. I found a new case with bearings for $25.

Since I was changing the P/S and rod, I think its worth peace of mind. So I'm out approx $115 on my rebuild on a $180 engine.

 

[SchrodeMode]

+1, I'd rather replace the bearings while I've got it torn down. You need to remember, those bearings are spinning at 35,000 rpm. I also agree that a rebuild on a budget engine, unless you get a great deal on the parts, isn't really worth it.

 

[2revo1maxx]

Bearings can be here today, gone tomorrow. I work with bearings every day and just because they feel ok doesn't mean they'll last. I'm not saying you couldn't get 10 or more gallons on a set, but if you're gonna spend $60, why not make it $80. I've seen them go bad in less than a gallon, especially when you have a new piston and sleeve set.

 

[bifft it]

would ya replace only the piston and rod in your car motor without replacing the crank and con-rod bearings? i think NOT

if ya did, you just wasted your money!

so why would a rc motor be any different? big waste of time, effort money and parts to have a bearing scatter a couple tanks after re-build and scrap the parts you just replaced
in my opinion, anyway