B20 VTEC rod bolt question


Loaf

Loaf

98 EK9
Joined
Feb 12, 2008
Messages
248
A b20 stock bottom end on a b16a head with ek9 cams and a hondata s300.

With arp rod bolts and head studs, what could it safely be rev'd to daily?

Are the headstuds necessary?

If I got the crank ballanced, with arp bolts and acl bearings, could I rev it like an ek9? On the standard b20 rods, crank and pistons?
 
ask al_himself

he's blew plenty of them up trying to rev them like b16b/b18c's
 
If I got the crank ballanced, with arp bolts and acl bearings, could I rev it like an ek9?
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The unhability to high rev the B20 is not going to be corrected with any of that mods. B20 rod to stroke ratio is poor for high revving applications and trying to rev it like a b16 will lead to cylinder wall failure mainly if block is not sleeved.

I'm not saying that engine X is better then Y, They have different characteristics so they will have pros and cons in different aspects.
 
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kulo said:
u need arp 8mm rod bolts
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I know the bolts I need, I'm not asking about what bits i need.

I need to know if I can occasionally (a couple of times a week) give her a good driving with a standard b20b bottom with arp rod bolts and head studs..
 
Add some ACL bearings in there and a crank girdle and IIRC it should be safe for 8k pretty regularly.
 
Kozy said:
Add some ACL bearings in there and a crank girdle and IIRC it should be safe for 8k pretty regularly.
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what crank girdle could i use? Would a b18c/b16a/b crank girdle go on with no modification?

golden eagle said that a main girdle is not necessary for an engine unless its an 800hp race monster.

They have built 500hp cars with no girdle with no probs.
 
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Typical USDM response.

A girdle isn't necessary I'm sure as my friend did the same build and his survived a lot of beatings, but if it was really unnecessary, then I'm sure Honda wouldn't have engineered it into the ITR motors which were designed for road racing applications.

500-800whp... not going to see any road courses...hence why I said it was a typical USDM response... most companies build motors to see racing 8-14 seconds at a time.... not 20-30min sessions x 4 at a lapping day.

Endyn Block Girdle
 
RagingAngel said:
Typical USDM response.

A girdle isn't necessary I'm sure as my friend did the same build and his survived a lot of beatings, but if it was really unnecessary, then I'm sure Honda wouldn't have engineered it into the ITR motors which were designed for road racing applications.

500-800whp... not going to see any road courses...hence why I said it was a typical USDM response... most companies build motors to see racing 8-14 seconds at a time.... not 20-30min sessions x 4 at a lapping day.

Endyn Block Girdle
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would that endyn one need to be line honed to fit or is it simply a bolt on one for a b20b block?

What about the 3,4 and 5 main caps? Would I use itr ones? Or b20?
 
Makes me wonder why I even bother posting sometimes.

Do you guys even read the links or are there just too many pictures that distract you from otherwise useful information?

These girdles are the same as the ones we use to stabilize the bottom ends on engines we build and we've priced them at an affordable $185.00 each.

*Note that no machine work is required for installation, and you will also need the following components.

(6) GSR/ITR main bolts for the center three main caps

(1) GSR/ITR oil pan

(1) GSR/ITR windage tray

(1) GSR/ITR oil pump pick-up tube assy

During reassembly, you will use the GSR/ITR torque schedule rather than the LS or B16 schedule
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For all else, it's best to contact Endyn directly to address any other queries.

Yes that came across as harsh - I'm sorry it did...
 
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Why would you need to rev it like a b16b? really?

Im yet to see a basic B20 that actually makes peak power past 8300rpm! hell my early 250bhp B20 only made peak at 8600rpm.

B20 stock block will happily rev to 8300rpm with out any issues or reliability problems.

Girdles are a great option, how ever i dont use one on my motor and that is the most powerfull N/A B20 in the uk that we know of, knocking on the door now for 270bhp and 170ft/lb Well balanced and lightened B20 crank, stock b20 caps, IB rods/wiseco pistons 84.5mm bore.

Daz
 
Ooh awesome having a B20 specialist replying!

Umm so a stock block with a b16a head and some type r cams without even changing to arp rod bolts will reliably rev to 8300 RPM?
 
Yep, so far we find the Head the issue with revs not the block, the B16a valve train is good to about 8500rpm and as said as a avergae B20 wont make peak that high there is no need to rev that high, If you want revs build a B18, if you want torque build a B20.

Daz
 
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