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Re: Bored out an A15? |
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No life (a.k.a. DattoMaster)  
Joined:
2002/7/19 12:41
From sydney australia
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I had a 1200 wagon with an A14, twin SU's & extractors. Not even electronic ignition. Was a wonderfully torquey engine, until it burnt an exhaust valve. I rebuilt it with a 79mm bore, a 70 degree cam, factory efi, an aftermarket fuel computer & an electronic dizzy. It had less horsepower, torque & was a lazy engine, due to the fuel computer being too crude. Should have just serviced the head with new valves, got some 76.5 mm pistons & not worried about efi. would have given it the cam though, as I've used the 70 degree cam before with great success. Doing the same with an A15 would be just as good.
Posted on: 2015/10/13 10:29
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Would it be possible to get a late model Nissan Micra, fit the 1.8 litre motor from a Tiida & then turbocharged it? Your answer must include parts numbers for the conversion. You have 12 months. Commence.
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Re: Bored out an A15? |
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Home away from home  
Joined:
2013/12/3 4:41
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hi b310gx.
thanks for you advice.. this is for my daily drive b310. standard a15 (block and internal parts from a15egi, except the head) with lightened flywheel,4-2-1 extractor and twin SU. BTW i want as quite as possible car for this set up.
if i have to sacrifice the engine life... better i stay away..
Posted on: 2015/10/12 8:15
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Re: Bored out an A15? |
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No life (a.k.a. DattoMaster) Joined:
2002/7/19 12:41
From sydney australia
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Boring the block to 79mm is a common thing for racing, as this makes the engine 1608cc's, which is allowable with CAMS' +3% rule. For the street, It depends on how you want to use the car. If it's a daily driver with a little cam, in my opinion the difference is not worth the cost. If it's an all out street racing engine, every little bit counts. It also takes away a lot of engine life, if you rebuild every 5 years or so with a 1mm overbore each time, that's 2 engine lives you've bypassed. You can get good quality 77mm pistons for about $100 Australian. I don't know what a good quality set of 79mm pistons would cost, but probably a lot more than $100. So, what do you want to use the motor for? If for a daily driver, they're not worth it, again that's just my opinion. If for racing, street or track, go for all you can get.
Posted on: 2015/10/12 7:54
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_________________
Would it be possible to get a late model Nissan Micra, fit the 1.8 litre motor from a Tiida & then turbocharged it? Your answer must include parts numbers for the conversion. You have 12 months. Commence.
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Re: Bored out an A15? |
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Home away from home Joined:
2013/12/3 4:41
Group:
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hi guys... im planning to bore one of my a15 to 79mm.
is the power gain is worth? please advice guy...
Posted on: 2015/10/12 7:34
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Re: Bored out an A15? |
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Home away from home 
Joined:
2004/6/12 3:02
From Albany, NY USA
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Quote:
myko2 wrote:
I just finished my A-15 project. Bored over 3mm. The nice thing about going that far over is the unshrouding of the valves. You will no longer need to have the pockets milled in the top of the bores for the valves. I found a GX head and wanted to run on pump gas so I needed to get pistons custom made with fairly deep dish. I had Venolia make the pistons and Deves made the rings. Pistons are forged with 12cc dish, giving me a CR of 9.75:1...perfect for pump gas. I am using the NISMO head gasket. Its been in the car now 3 weeks, and all seems fine. I can now keep up with modern traffic .
Cool  Tell us more! What cam, carb and exhaust are you running? 
Posted on: 2004/6/19 23:20
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Re: Bored out an A15? |
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No life (a.k.a. DattoMaster) 
Joined:
2003/12/3 7:56
From Christchurch NZ
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Quote:
blownb310 wrote:
A14force: is that a blower on your car? In your avatar the carb is sitting very high.  
Too right mate! There are some pics of it some where, who_your_datty_1200 posted em for me.
Posted on: 2004/6/19 22:04
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Forced Induction!
Because everyone knows you don't bring a knife to a gunfight!
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Re: Bored out an A15? |
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Just can't stay away  Joined:
2004/6/15 3:27
From Burbank Ca.
Group:
Registered Users
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I just finished my A-15 project. Bored over 3mm. The nice thing about going that far over is the unshrouding of the valves. You will no longer need to have the pockets milled in the top of the bores for the valves. I found a GX head and wanted to run on pump gas so I needed to get pistons custom made with fairly deep dish. I had Venolia make the pistons and Deves made the rings. Pistons are forged with 12cc dish, giving me a CR of 9.75:1...perfect for pump gas. I am using the NISMO head gasket. Its been in the car now 3 weeks, and all seems fine. I can now keep up with modern traffic .
Posted on: 2004/6/19 17:04
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Re: Bored out an A15? |
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Home away from home Joined:
2004/6/12 3:02
From Albany, NY USA
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Registered Users
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Quote:
feral wrote:
I am having a batch of double faced steel/composition centre, rolled fire ring gaskets being hand made at the moment.
Crush thickness will be 1.1mm.
More details when they are in stock.
Great news about the gasket availability guys. Right now, I am using the Nismo gasket and they cost $75 US each! :-The Nismo catalog also list an 80mm metal head gasket! Same price.
Posted on: 2004/6/19 15:12
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Re: Bored out an A15? |
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Home away from home Joined:
2004/6/12 3:02
From Albany, NY USA
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Registered Users
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Quote:
A14force wrote:
Pardon me for asking, but did you say that this motor was going to be supercharged? If your going to force feed it with that sort of compression, you'll have to run methanol.
You're right, That C.R. would be too high for the blower with gasoline. I'm still waiting on the inner valvesprings for final assy. Once I actually determine the C.R. I will decide what I will use. Perhaps I will end up using my Redline manifold with twin 44 Dellortos. Perhaps I should not have had the block decked .065" if using the blower was in mind then. Maybe 10.25 to 1 was an overestimate as well. I'll know soon and post the results. A14force: is that a blower on your car? In your avatar the carb is sitting very high.
Posted on: 2004/6/19 15:01
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Re: Bored out an A15? |
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Home away from home 
Joined:
2002/5/1 12:48
From Millgrove Vic OZ
Group:
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I am having a batch of double faced steel/composition centre, rolled fire ring gaskets being hand made at the moment.
Crush thickness will be 1.1mm.
More details when they are in stock.
Posted on: 2004/6/19 12:49
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Cheers Feral
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