Help me to not blow another BP
#1
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Join Date: Nov 2013
Location: Sardinia, Italy
Posts: 396
Total Cats: 56
Help me to not blow another BP
I'm currently building a BP with supertech 84mm 8.6:1 and a BP05 head
I built the bottom end with the "moderate turbo/nitrous" ring gap, and after that I took some measuraments:
actual compression ratio is 8.5:1
the top of the piston is under the block, 0.4mm under
with a 1mm oem headgasket the piston to head gap (squish) is 1.4mm
Is this a good gap or I have to shave the block?
pics from my diy thread
I built the bottom end with the "moderate turbo/nitrous" ring gap, and after that I took some measuraments:
actual compression ratio is 8.5:1
the top of the piston is under the block, 0.4mm under
with a 1mm oem headgasket the piston to head gap (squish) is 1.4mm
Is this a good gap or I have to shave the block?
pics from my diy thread
#3
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Thread Starter
Join Date: Nov 2013
Location: Sardinia, Italy
Posts: 396
Total Cats: 56
my old head was gone, and it's near the impossible to find a good used bp4w head in Italy.
Seems like ALL the mx5 in Italy are 1.6l
Even the NB/Fl
I asked to a ebay uk seller for a good used head for "my bp 99-00 mx5"
they said "we have 5 spare bp05 heads in good shape"
I didn't know bp05 != bp4w, because as I said there are NOT 94-97 1.8 mx5, and the few are imported
I spent MANY hours of porting work on that head before I noticed the fail, so here it is: I will use that head because **** threes and horses, I want lemons.
also: I found a bp-ze head + oil pump combo for 300 €, but I have an ms2, so I can't control vvt
Seems like ALL the mx5 in Italy are 1.6l
Even the NB/Fl
I asked to a ebay uk seller for a good used head for "my bp 99-00 mx5"
they said "we have 5 spare bp05 heads in good shape"
I didn't know bp05 != bp4w, because as I said there are NOT 94-97 1.8 mx5, and the few are imported
I spent MANY hours of porting work on that head before I noticed the fail, so here it is: I will use that head because **** threes and horses, I want lemons.
also: I found a bp-ze head + oil pump combo for 300 €, but I have an ms2, so I can't control vvt
#9
Junior Member
Thread Starter
Join Date: Nov 2013
Location: Sardinia, Italy
Posts: 396
Total Cats: 56
Thank you all for the answers, as I said I will use that head. If that means 30 whp less, I can live with that
It was my mistake, but now is too late to going back: to many hours of work, also I bought the hondata gasket, so what is done is done.
Talking about reliability, I have the bolts that came with cx rods. I know that most of you are using arp2000, are these a "must to have" or I can leave cx ones for a 250-ish rwhp goal?
What about mains?
It was my mistake, but now is too late to going back: to many hours of work, also I bought the hondata gasket, so what is done is done.
Talking about reliability, I have the bolts that came with cx rods. I know that most of you are using arp2000, are these a "must to have" or I can leave cx ones for a 250-ish rwhp goal?
What about mains?
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