I have my A15 stripped and ready for rebuild, plan is for 77mm std type pistons, Webber 32/32 DGAV on std manifold, i have a H89 head and tubular exh manifold.

i have a 60A 5 speed and 3.7 diff ratio.

i want a good streetable engine with more power, aiming for 110hp based on what i read.... i'm more after torque and acceleration than top end speed....

wade cams are recommending their 240 type profile which is 220 deg duration at 050" and .407 lift.

has anyone experiance of this cam ? im a little worried that it might be too much for what i need, but trust wade that they know better than me....

has anyone with more experiance got any comments on my spec above ? its my first engine mod project......so please feel free to criticise...

Interesting

No way that will return 110 HP.

To make 110 it needs to rev. Which 3.7 gear is not conducive. Go with 4.11 at least to let it rev and give increased torque multiplication for better acceleration. The gear change will have more performance effect than the cam change.

Once you get the engine revving, then the cam can work. Wade recommends Twin Weber carbs, springs 4000-7000 rpm.

ok, good to get a definate response !

maybe it would be better to describe what i'm trying to acheive....

Car will be used for 250km run on motorway, cruising at around 120kmh twice every weekend (from my home to where i work) with several fast starts at the tollgates to beat the corrolas and civics back to the road, then 'spirited' back road driving at weekends and short commute to work each day of 20mins..

Car is actually a frogeyed sprite that has been lightened with fibreglass bodywork and weighs just under 500kg....

What i suppose i'm really after is something that can be happy cruising along in the first barrel of the carb, then become a monster once i open up the second barrel... maybe unrealistic....

following the wiki on performance i have been getting used to revving the engine and am now quite happy to drive along at 4-4500 revs where as that used to scare me a bit being used to driving a diesel otherwise....

current engine is a A14, completely std apart from tubular exh manifold and electronic ignition... i like the current engine, but find that quite often i have my foot pressed to the floor and nothing in reserve....

The A15 i have i found in the scrapyard, i have a machine shop nearby that will do basic work and i have a good motor factors nearby also...

what would you guys recommend ?

Sounds exactly like the motor I'm going to rebuild for my Sunny Wagon. I'll be using the factory 70 degree grind, which is slightly 'warmer/hotter' than the GX grind.Ive used it in an A12, a stock bore A14 & a 79mm bore A14, with good results. Nice smooth idle, plenty of torque & a decent top end. Twice I've used DGV webers, the other time factory injection with a rather crude computer. I'll be getting mine through SWR up here in Sydney, on 02-4577-2400
but there must be somebody down there in Victoria can supply the grind for you. The name Les Collins seems to ring a bell.

That Wade cam doesn't even start until 4000 rpm.

Quote:
Don't bother to change the cam as the stock A14 cam runs best at 6000 rpms. Get used to it. The Civic boys will be turning 6000 rpm when accelerating.

i'm in Thailand and have given the cam to an Australian friend to take back home for me and post to the grinders internally, then it will have to be shipped back to me by airmail.., so it dosent matter really where i get it from, but Wade seem to have a good rep and responded quickly to my initial request...

I thought the Wade suggestion seemed a bit too big... thats part of why i posted this.... but my understanding is that a cam which will be lumpy and peaky for a 1200 would be more civilised for a larger engine by virtue of the capacity.. or is the capacity spread we are looking at here too small to have an effect ? i assumed the rev specs would be based on the 1200 as bigger engines would be more flexible..

Spec i gave to Wade was for best power at around 3-4,000 rpm range..

Its still a high rpm cam ... as is the stock A14 cam, and it sounds like you don't want to rev that high.

Suggestion: if spending money on new pistons and boring the engine., why for t the little 77mm pistons? 79mm versions will return more power than the other change.

yes, i thought about 79mm and read about it in the excellent tech wiki here...
i have a problem that its difficult to communicate with the machine shop.... they are great and helpfull and if you turn up with an engine block you dont even need to speak to them and they will just sort it out for you within a day, but i'm a bit worried about getting something out of the ordinary done such as special small end bushes as it has a high likeliness of screwup... if there was some off the shelf pistions which used the standard A15 small end pins then i'd be happier to go that way... decking the block if required would be ok to do....

Just re-read that last post and changed my mind, i shouldnt give up on the 79mm idea just because its slightly more difficult.
A 1608cc engine would give lots more torque to help overcome the high gearing and my somewhat lazy driving style and it would be something to be proud of...
ive decided to go ahead ...

So, new spec
79mm justy pistons and pins, A15 block, crank and rods.
factory 70 degree grind camshaft, weber DGV, tubular exh manifold, H89 head, thinner head gasket, decked block, electronic ignition....

have i missed anything ?
How about the justy pistons, do they have the offset dish to help with the quench effect of the H89 closed chamber head ? or would a H75 head be better ? ( i have both under my bench)
What CR should i be looking for (91 octane fuel).

Again.. pls feel free to criticise !!

andy