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motor already blew up, before being assembled

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Total Members Voted: 49

[Joseph Davis]

Why the hell are the valve pockets always so goddamn huge on aftermarket pistons?

Oversize valves, fast guide wear in big power (heat) motors causing less than positively located valve faces, then rip off some 800+ whp passes and the valves warp slightly until they cool back down making the situation even worse.

Also, fuck you.

[snm95ls]

Why the hell are the valve pockets always so goddamn huge on aftermarket pistons?

Oversize valves, fast guide wear in big power (heat) motors causing less than positively located valve faces, then rip off some 800+ whp passes and the valves warp slightly until they cool back down making the situation even worse.

Also, fuck you.

Seems like a lot of wasted real estate for shelf pistons to me.  Maybe this is my ignorance, but how many are actually running 1mm over sized valves or more?  I can't imagine it is a huge percentage.  At the levels that you are talking about, I would think that a customer might be able to afford custom(ish) pistons.

We aren't talking about domestic V8s where .600+" lift and 260+° at 0.050" cams are somewhat common place.

Granted, I have yet to build a Honduh with forged pistons, so I honestly have no clue how tight P2V is on them. 

[Joseph Davis]

I'd say 7% of the engines I've tuned had 1+mm oversize valves.  0.5mm over is fairly common, moreso with the all motor crowd.

[Teg2boo]

Smoothed pistons edges.

[Joseph Davis]

Cool, now grind down the sharp edges along the valve reliefs.

[Teg2boo]

Cool, now grind down the sharp edges along the valve reliefs.

You are talking about 1, 2 or 3?

1 and 2 should be smooth enough.

I was  a bit worrying how far I should grind down #3...

 

[Teg2boo]

I redid all four pistons.

Almost finished port and polish on the head.

[Teg2boo]

I thought I was almost done with porting, but it's fucking long. I think I loose more time changing tools because they fell apart than porting the head.

Still need to buy 400 grid sand paper to smooth out the exhaust ports and intake bowl. I only had 220, 800 and 1000.

I'm pretty happy with the result tho! I can't do better than that around the valve guide... The rest will be done by hand.

Exhaust side



Intake side

[Teg2boo]

Before all that fucking work:

[Joseph Davis]

Is this the first head you've ported?  I'd have taken the intake divider a bit further - that is, if I had the manual dexterity for porting, which I don't.  All in all, doesn't look bad. 

[Teg2boo]

Is this the first head you've ported?  I'd have taken the intake divider a bit further - that is, if I had the manual dexterity for porting, which I don't.  All in all, doesn't look bad. 

Yeah, it's the ported head. PR4Y. I might remove a bit more from the divider later. I had to finish most of the work today cause I'm sending it to the machinist.

Here is the final result on the exhaust side (intake is mostly the same as pictured above I just polished the bowl):





How I work:

[Joseph Davis]

Honestly, for a street car it's going to rip as is.  If you really feel like doing more work, or want to port more heads, I'd thin the divider more where it joins the top and especially the bottom of the port.  You aren't increasing the crossectional area by doing this but instead are making the entry into the bowls not be such a sudden transition to bottlenecking.  This helps the flow increase in speed as it *flows* past the valve on the intake stroke, instead of making the piston on it's downstroke struggle to draw air down the port.  Well, it still does that just not as bad.

[Teg2boo]

Ok cool! Noted for future build.

I don't think I'm gonna work on this head anymore...

All the parts are at the machinist.  ;D

Block bored, decked. Crank micro polished.  Everything balanced. Head planned, 3 angle valve job.

All this for 835$  My wallet scream.

[Teg2boo]

Got my crank, flywheel and bearing back. I think I'll get the rest tomorrow. The guy looks to know what he is talking about.

The only thing I'm still not sure is block guard. It's funny cause the guy said "You can do 300hp without guard, but 350hp with a guard".

Yeah, but why people still do 400-450hp on stock sleeve then? My goal is 400hp anyway... Block guard will be no help at this power.

This motor already ruined me. I can't invest any more money.

If the balancing is ok, the top of the sleeve is not supposed to move imo...

[BoostedSchemes]

if i were you i would have grabbed a stock 265k b18 from the junkyard and spent the money on tooning and beer since there is a 65% chance of you tunigging this motor into the grave if you try it yourself

[Teg2boo]

You know a lot more than me on tuning. It's a known fact.

[BoostedSchemes]

well if sure blown up more motors than you, and my goal is to reach the jd kill zone by 30

[Teg2boo]

Tuners are overrated. I'll ask my cat to tune it for me.

[BoostedSchemes]

ill tune your cat for you


</threadjack>

[Teg2boo]

ill tune your cat for you


</threadjack>

Please, don't clogged my cat.

[widebody93]

Good skeeting material in this thread. Makes me wanna swap a B in my daily! With boost of couse 

[Teg2boo]

Machinist doesn't seem to agree with me on the block guard.

I'm still confused about it too, but fuck that. We'll see how it goes.

The fact that the block guard limit the coolant flow at the most important place is what turned me off. If the sleeves are hotter they are also weaker. No?

[Teg2boo]

Bump for Chris M. and his good products. N00bs, buy this shit!

cheap 74 throttle body honda b-series

[Teg2boo]

I got the parts back from the machinist yesterday. Again, a lot of photos... I will paint the front of the block like the head (machinist painted the head). I don't think the back of the block worth my time...

Build simulation here:

[crxvtec91]

Block guard is not needed. Painting the block 

[Joseph Davis]

What's wrong with a painted block?  I'm painting mine.

[Teg2boo]

Block guard is not needed. Painting the block 

Everyone paint their block... I don't know where you live...

[BoostedSchemes]

stupid americans. i reccomend you paint your block, but so it doesnt look weird, paint your accesory brackets and accesories too. dont forget to get the alternator + bracket painted... a lot of people forget to paint the thermostat housing and it just looks stupid.

[Teg2boo]

Fuck, I was distracted while I was gapping my last ring and there is too much gap.

I did 3.209*0.0065= 0.021

and now it is at 0.027 which give a 0.0084 multiplicator. That's 0.006 more gap 

How fucked I'm I ? 

Why shit like this always happen at the very last thing to do...

[Joseph Davis]

It won't matter.  If it's the top ring it really won't matter.