TETVTEC

Hey....

Arrrgh....

Damn... Just blew my third Headgasket on my Daily driven EG w/ Boosted D16 in it..!

Q: Boostin 25-26psi on my BUILDT D16 engine... pushing 445whp/355 ft/lb...
We know that the exhaust system is a bit on the narrow side..
3" Dp.. with a sharp bend just 4-5" out from the turbo..(90+ degrees)
and into a 2,5" "Cat-back" system.. only one muffler in the rear..
The engine works fine for a short while.. but after pushing more than
20psi for a couple of times.. it blows all the coolant out of the radiator
and into the Expansion tank...!

We do now suspect this problem to have something
to do with BACKPRESSURE from the narrow Exhaust system...!!?

any thoughts....!?

Scott_Tucker

No, that's not going to cause it. Did you ever have your head pressure tested when it was off? It may have a crack.

ahobbs

back pressure will cause other issue's.

have you gotten the head resurfaced everytime? Is the block truly level? what headstuds are you using?

neek175

Head could be warped,or lifting... what headstuds are you using...or headgsket? Its not your exhaust.

TETVTEC

Hey...

Think the head is crack-free..
Resurfaced the head before last gasket change....
ARP headstuds...
Not checked the block though...
Honda Gasket.....

it does tons of dyno time on 9-18ish Psi...
but dosnt like it when we turn up the boost past 20....(23-26)

(Yupp.. thats a China-Turbo on a D16.. Pushing 445whp/355 ft/lb.. )

neek175

How many times have you reused those arp headstuds? Also could be too much timing in your tune.

TETVTEC

Hey...

That would be three times total...

Runnin E85 on this one...
The tuner is the best there is , here in Norway when it comes to tuning and buildings Hondas...
But of course , anybody can do mistakes...

Damn.. wish i could be satisfied with "only" 350ish whp... LOL
But.. once you go 400+.. you dont wanna go back...
(Especially like the torque.. 355 ft/lb... yummi..!!!)

non-VTEC

wow that's allot of torque from a d16....

what kind of head gasket are you using? what are you tuning with and how much timing are you running in the 20psi+ range?

if you change out the exhaust to a full 3" you will gain more power all over. and you can probably make the same power with less boost.

TETVTEC

Hey...

Yupp.. quite pleased with those numbers... so far.. !!
The highest number we`ve seen , was 366ft/lb...
But the China/ebay turbo i maxed out..started to surge...
so puttin on a Garrett T3 60-1 later.. have one that needs
a overhaulin back at my friends Garage.. cheap-cheap.!!

Using Stock Headgasket from Honda.....
Hondata S300 and the tuning is done on a Dynapack..!

Dont have the Laptop lying around , so i cant find
those ignition numbers for you..!
I`ll try to find em later...

Yeah.. a full 3" exhaust will do the trick... commin soon..

But need pay some attension to my other ride now ,
its been 4 years since i dropped a valve @ 8800 rpm....
and just recived my new engineblock last week..

atec

How can you tell its too much timing the engine needs just off the map numbers I may ask?
You may want to look at the dynosheet instead or you maybe know how fast this particular engine and setup combust?

The engine has a blockguard with 2mm holes for coolant in it(supertech), the engine produces HIGH! amount of tq therby heat, and the heat comes after the rev is down, the D waterpump is bad as it is, and with a bottleneck like this particular blockguard the water dont flow nearby as much as it should. I have a slight feeling the block is warped from the first boiling run you had on the street when the termostat was stuck while you pushed the car at the road.

With using a bigger exhaust The engine will after a tune produce the same power with less boost. means cooler intake air, probably also less tq (tq rides further up in rpm scale)
And with a upgraded waterpump,a decking of the block it should be able to get enough cooling.

The timing at WOT with 25-27psi boost is around 17-19degrees and it interpolates between the two lines 22-23degrees and 17-19degrees dependant on where it made it*s Peak tq without knocking, the plugs are superclean and indicates a normal combustionchamber temperature.

TETVTEC, we have discussed this before I think

jdmeg2808

I still have dat problem only worst. I cracked two sleeves in 2 different built d16 already. I really don't knw wat is it wit d16 not being able to hold dat much boost on a stock sleeve. So now I am sleeving my block n. Hopefully dat will solve all my problems.

Atec- every1 tells me dat on here too about running too uch timing but wen I checked with my tuner he said my timing. Is already on da conservative side at full boost . 19-21 degrees...

kyden

19 is way too much on a d series at any boost level.

ExospeedAMcrx

Timing is the headgasket buster for the D-series. Thats a common issue on a D if you're putting timing when it can't handle it. Stock headstuds should never be reused and aftermarket like ARP technically shouldnt be reused more than a couple times. The best way is to check for stretch but if you can't do that, I suggest getting a new set. On our Race cars, we never reuse head studs at all when we are putting a new motor together.

The oem headgaskets are great, just back up on the timing, get new headstuds, torque them down just a little higher than suggested and make sure you use an engine assy lube or some kind of lube for headstuds. NEVER Tq it down with just reg oil.

jdmeg2808

So how is it dat a d can mmake power. With minimal timing? Run more boost?

rich7777

Yeah use a bit more boost and less timing and see if that helps. Its not as efficient as using more timing but from what i hear helps with problems like this. It's moves peak cylinder pressure to a later crank angle...

Hybrid96EK

I know its off subject, but would it be possible for you to use correct English? Specifically replacing "dat" with that and "da" with the?

SovXietday

Hoooooly ****. 21 degrees of timing is insane for that much boost.

It's not about cylinder temperature, it's about cylinder PRESSURE. The Ds just don't have enough surface area to keep high pressures like that from blowing the headgaskets.

The timing needs to go down, a lot. Honestly, you probably won't lose that much power either. Luckily with Dseries headgaskets will go before you detonate usually, but you're really high on the timing side.