2g 6 bolt engine

[NeedAGST]

ok lately i been seein a lot of thise 6bolt talk around the net... ok so i need to know whats so great about gettin a 6 bolt swap in a 2g gst/gsx. does it prevent crankwalk? more hp? better response? what what tell me idont know anythin about it. is it simply a jdm 4g63?

 

[Wanted:SWGSXAWD]

Here's a few I've seen:
1. bigger throttle body
2. better flowing air intake manifold
3. better flowing head
4. the 1g block has better oil passages... I think
5. the 1g block isn't really known to have as many reported cases of C/W even though it's supposedly rare anyway.

Oh yeah, some JDM engines come with a 16g turbo so when folks blow an engine, thats an extra bonus that you can keep or sell to absorb some of the cost, but most junk yards have 1g engines that can be had for cheaper. As far as horse power numbers, I would assume you can reach the same 400hp mark on stock internals as a 1g, but some port work would need to be done on your 2g head, TB, intake, and manifold . I would eventually like to do a 1g head swap though it seems like a good idea.

 

[Lunch_Box]

If you go stock to stock a 6 bolt can handle like 50 more hp. And the 6 bolt is less prone to crankwalk also.

 

[dave99gst]

i duno about all that -- stock 2g is rated @ more HP then stock 1g ( and toss in there thats with the stock 1g having a bigger turbo )

 

[GSX_RCR]

i duno about all that -- stock 2g is rated @ more HP then stock 1g ( and toss in there thats with the stock 1g having a bigger turbo )

The HP difference is mostly based on the 2G's higher compression pistons and higher boost levels (stock-wise).

As far as potential goes, both blocks are built to take 400whp on stock internals. Some people are paranoid when it comes to crankwalk, but there are numerous 2G guys running close to 400whp on the stock 7 bolt.

BTW, if you're looking for a 6 bolt, try to find an EVO III 4G63. It has the Big16G and 5xx cc injectors.

 

[killab443]

I agree with gsxrcr. You'll also find that jdm 6 bolt engines have a little more power. It does due the the cyclone intake manifold and thats the only thing that makes it different from the usdm engine. Most people know this im just making others aware

 

[Lunch_Box]

I wasn't saying that they have more power but that they can handle a bigger HP load.

 

[92tsiawd84]

A local MN person is putting out 457 whp on his stock 7 bolt.

 

[crankbender]

Reguardless of what an odd person here or there may have done the 1g engines (6 and 7 bolts) had larger sturdier rods stock. This is the typical faliure point for the stock engines and results in the 1g engines being capable (on average) of making more power on stock internals. Now the stock numbers are higher on the 2g because they have a higher compression ratio and similar boost...this doesn't help them when it comes to max power however.

The JDM cyclone intake does not increase power across the entire power band. The idea of it is to increase low end response. Now getting a cyclone intake to work with a US ECU will be a challenge.

The real differences are (for the purpose of doing the swap)

6-Bolt blocks are less likely to crankwalk.
6-Bolt blocks don't have the suspect oil squirters.
6-Bolt blocks are slightly easier to work on some pieces because they lack some internal sensors.

All in all the real reason is because many 7 bolt motors that have crankwalked and were rebuilt crankwalked within a few thousand miles...leads one to believe the problem is with the block/crank.

 

[94Talon2]

6-bolt cranks are heavier and beefier.

 

[killab443]

The 7 bolt oil squirters use the same oil source as the main bearing on the crank thats why they crankwalk rite? Because the oil squirters starv the bearings of the oil they need/ Thats how someone explained it to me once

 

[Lunch_Box]

I don't think there is one exacpt reason for crankwalk but abunch of ideas.

 

[half-cocked]

I've read that the 2G cranks have machine flaws and I've also read that the 2G squirts can get stuck open and at low RPM when oik pressure is at its lowest this causes it to go even lower since oil squiters dont squirt all the time, add that to people holding in the clutch at red lights and what not puts to much strees on the thrust bearing and not enough oil. Magnus motorsports has a cool tech article on it.