Rod knock confirmed

[Cooper-97gst]

Hey guys so i just pulled off the oil pan and confirmed rod knock. I have a couple questions. Being its fwd my goals for the car are, to have a fast, reliable, dd.I was looking at the Frankenstein lower end rebuild kit from dsm graveyard DSM Graveyard - Your #1 Source for DSM Parts!

is this over kill for my goals? cant i just reuse my crank and rods sinse its basically the same set up and save some money? or am i able to just replace that spun bearing and call it a day?
what are your thoughts and opinions, any other suggestions are welcomed.

 

[shockracer]

How bad is the bearing? Any pictures?

 

[TofastForU_99]

Shoot me a PM with what you are looking for We would love to build you a block.

Also do your research and check the vendor reviews.

 

[Force Fed 4g63]

X2 on pics, can't tell a whole lot from what you described. Also, if you order from them be prepared to wait a very long time to get it.

 

[Cooper-97gst]

i havent pulled it out but it started knocking 2 blocks away from home so i turned the car off and pushed it the rest of the way. haven't ran the car since. do you need pics it out? i could get on it right now...

 

[D666Shadow]

the crank is what matters. you can get a good used rod anywhere. i have the same problem with one of my dsms right now. mic the crank and compare to oe specs. chances are it will spin again, try to find a good used 7 bolt short block or if your just gonna dd it, fine a rebuilt or used 6 bolt and modify the motor mount. a 6 bolt is going to hold up great as a dd but if you did get the franken block it would last a long time and you wouldnt have to worry about spinnin any more bearings for awhile. it depends how much money you have/

 

[Cooper-97gst]

How bad is the bearing? Any pictures?

ok i got the pictures for you guys to look at

X2 on pics, can't tell a whole lot from what you described. Also, if you order from them be prepared to wait a very long time to get it.

here they are

 

[Alex7747]

That crank will have to be cut and the rods align honed if you're going to keep it stock (stock rebuild). What's your budget OP?

 

[Cooper-97gst]

That crank will have to be cut and the rods align honed if you're going to keep it stock (stock rebuild). What's your budget OP?

abt $800 at the moment

 

[Alex7747]

abt $800 at the moment

thats more then enough for a stock rebuild. I got all my machine work done for about 350. that included a full cylinder head rebuild with 3 angle valve job and the crank turned and the rods align honed. the block was also bored and honed .020" over.
thats just one route you could take

 

[Cooper-97gst]

thats more then enough for a stock rebuild. I got all my machine work done for about 350. that included a full cylinder head rebuild with 3 angle valve job and the crank turned and the rods align honed. the block was also bored and honed .020" over.
thats just one route you could take

awesome, so you think a stock rebuild would be enough for my goals? should i just forget abt the frankenstein kit and the evo 9 pistons? im only shooting for abt 300whp. i would like to maintain reliability.

 

[Alex7747]

awesome, so you think a stock rebuild would be enough for my goals? should i just forget abt the frankenstein kit and the evo 9 pistons? im only shooting for abt 300whp. i would like to maintain reliability.

A stock rebuild could handle that (300 whp) no problem .

 

[Cooper-97gst]

kewl, might look in to evo pistons anyway if theyre not to pricy...

 

[Alex7747]

kewl, might look in to evo pistons anyway if theyre not to pricy...

If I'm remembering correct, they run about the same as some forged internals. At that point you want to just go full on built motor.

 

[stuckwithgsx]

A stock rebuild could handle that (300 whp) no problem .

^ That will also help maintain reliability.

 

[Alex7747]

^ That will also help maintain reliability.

Im not sure if you're saying a stock 4g wouldn't handle 300 whp reliably, because if you are then you're incorrect.

 

[RadDsm]

I think he is saying that a complete stock rebuild will be reliable.

 

[Alex7747]

I think he is saying that a complete stock rebuild will be reliable.

I thought so, but wasn't sure . Sorry about that stuckwithgsx.

 

[Cooper-97gst]

If I'm remembering correct, they run about the same as some forged internals. At that point you want to just go full on built motor.

If i go stock internal with evo 9 pistons what will that do for performance? dont see its being a huge impact on reliability. Will that help with turbo spooling? hp? if its not much difference than ill go stock... im wondering if it will help with power with out going in to boost, I plan on getting and evo 3 16g this summer, but with prices going up so high, i think i might just invest in dsm link instead.

 

[Alex7747]

If i go stock internal with evo 9 pistons what will that do for performance? dont see its being a huge impact on reliability. Will that help with turbo spooling? hp? if its not much difference than ill go stock... im wondering if it will help with power with out going in to boost, I plan on getting and evo 3 16g this summer, but with prices going up so high, i think i might just invest in dsm link instead.

Im not too sure about evo 9 pistons but the evo 8 pistons have the same compression ratio as the 2g DSMs. So you wouldn't see a change in performance.

Something to consider, the weak point of the 7 bolt engine is not the pistons, but the rods are the weakness. Instead of getting evo pistons, try looking for some stronger rods. I believe the evo 8 rods can hold more power then the 2g DSM rods. If I'm wrong, someone chime in.

 

[kmarttalon]

I believe 800 is plenty for a stock rebuild. I just sold a 92 fwd talon dynoed alittle over 300 with 192000 miles on the clock

 

[Cooper-97gst]

Im not too sure about evo 9 pistons but the evo 8 pistons have the same compression ratio as the 2g DSMs. So you wouldn't see a change in performance.

Something to consider, the weak point of the 7 bolt engine is not the pistons, but the rods are the weakness. Instead of getting evo pistons, try looking for some stronger rods. I believe the evo 8 rods can hold more power then the 2g DSM rods. If I'm wrong, someone chime in.

I just read, evo 9 pistons are 8.8:1 compared to the 8.5:1 on a 2gs pistons...i guess idealy i would go with evo 9 pistons, and 6 bolt rods o my 7 bolt. now i have to do the math to see if $800 will cut it!

 

[Alex7747]

I just read, evo 9 pistons are 8.8:1 compared to the 8.5:1 on a 2gs pistons...i guess idealy i would go with evo 9 pistons, and 6 bolt rods o my 7 bolt. now i have to do the math to see if $800 will cut it!

If you have enough money for both (the evo 9 pistons and 6 bolt rods), get them both. But if your budget only allows for one or the other, get the 6 bolt rods.

^this is assuming the 6 bolt rods are machined to fit on the 7 bot crank..

Also, don't buy any parts yet. Pull the motor apart first and see what needs to be replaced and what can stay (and by stay i mean whats still in spec).

 

[Cooper-97gst]

If you have enough money for both (the evo 9 pistons and 6 bolt rods), get them both. But if your budget only allows for one or the other, get the 6 bolt rods.

^this is assuming the 6 bolt rods are machined to fit on the 7 bot crank..

Also, don't buy any parts yet. Pull the motor apart first and see what needs to be replaced and what can stay (and by stay i mean whats still in spec).

Will do, the engine is out of the car, but went get to tear it down till sunday. does where can i find the info on the specs to check?

 

[RWD4G63]

Your crank will need cut and you'll need oversize bearings, that's all good and proven reliable.

I think the evo pistons are a really pointless mod, you're never going to notice a .3 bump in compression ratio. There are plenty of stock bottom end 7-bolts making 300whp. If you're really dying to upgrade something, do the 6-bolt rods and/or arp rod bolts.

The biggest thing is to make sure you clean everything extremely well.