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#Post#: 100--------------------------------------------------
8v engines: how quaint
By: RobT Date: July 13, 2012, 9:55 am
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When 16v heads are available, why waste all that time and effort
on 8v heads?
;D
What am i missing?
#Post#: 101--------------------------------------------------
Re: 8v engines: how quaint
By: Stooza Date: July 13, 2012, 10:22 am
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I guess it's down to what you like. I have 8v and 16v and they
both reward me in different ways matey. There is just something
about an 8v that breaths at the top end tho..
#Post#: 103--------------------------------------------------
Re: 8v engines: how quaint
By: JMR Date: July 13, 2012, 3:22 pm
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Now now...this is'nt the fight club...lol! :D
Quite a lot comes into it as we all know...class regs...costs.
..performance requirments.
A friend of mine has both an 8v Mk2 GTi and a Civic type-r. When
asked if the Mk2 ever feels lacking after getting out of the
Honda his answer was "does it f$#k"!
The Mk2 isn't "quite" std...2tr, ported head, lumpy cam...circa
150hp...but as he says. .it "grunts" better low & mid range than
the Honda. .the Civic picks up where the Golf tails off in the
rev band..."I don't always want the drive like my pants are on
fire" was his statement. ."which the Honda needs to get the key
advantage from it".
#Post#: 106--------------------------------------------------
Re: 8v engines: how quaint
By: RobT Date: July 13, 2012, 4:01 pm
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Just being provocative....:)
Of course a lot of factors come into it.
#Post#: 285--------------------------------------------------
Re: 8v engines: how quaint
By: Tav Date: August 17, 2012, 6:16 pm
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Class regs for me otherwise I'd slap a 16v head on the 8v Polo
block...
...but there is something intriguing about the challenge of
getting an 8v to perform.
#Post#: 299--------------------------------------------------
Re: 8v engines: how quaint
By: Tonyb Date: August 18, 2012, 9:22 am
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Don't get sucked in to the 'you need a 16v head to win' myth!
There is no doubt that a 16 v engine will out perform an 8v
engine, like for like, but there are 8 more of everything
required so there is a cost to consider as well. The difference
is not as great as everyone would have you belive, trust me I
know ;) just doesn't sound very trick.
This is how I see it (although I'm sure everyone won't see it
the same). Based on cost/work involved etc. Obviously it depends
on what you start with 8v or 16v. If you want up to 160bhp
either use a std 16v with some sort of induction/ECU mods etc or
tune an 8v cams/head/pistons/induction. Probably cheaper if you
start with a 16v but not if you have to source a 16v.
If you want between 160bhp to 200bhp probably 16v only,
cams/porting/induction. There is a big jump from 160bhp to
200bhp in an 8v but it doesn't need to cost much more than
160bhp if you miss the intermediate stage out. So over 180bhp up
to around 220bhp 8v is probably more cost effective as you have
8 of everything as opposed to 16 of everything, over that your
back in to 16v territory.
200+bhp 8v Golf is a seriously quick motorcar and with a good
chassis and a tidy driver is good enough to beat most 16v cars
you are likely to come across in the class on a good day. The
cam/pistons/induction etc to achieve 160bhp as opposed to 200bhp
in an 8v cost the same, you just need to spec the right one for
your needs! You need more head works/valves/valvetrain work etc
for higher power engines just because the parameters are greater
and the stresses bigger.
In summary plan and understand what you want to achieve before
you start and buy everything once as opposed to buying something
and 6 months later buying a bigger/lumpier/wider one! As I said
8v doesn't sound trick and ultimately a 16v will go quicker but
don't believe everything you hear about 8v's ;)
#Post#: 376--------------------------------------------------
Re: 8v engines: how quaint
By: JMR Date: August 30, 2012, 3:24 pm
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Well said Mr b!....
Particularly the bit about planning ahead regarding the use an
engine is going to be put too...numbers arnt the be all and end
all...performance, and the delivery of that performance/power
spead should be taken into account.
#Post#: 384--------------------------------------------------
Re: 8v engines: how quaint
By: Stooza Date: August 31, 2012, 5:59 am
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Yeah, I will be owning both 8v and 16v soon, I cant give up on
the 8v, it's addictive and rewarding
#Post#: 583--------------------------------------------------
Re: 8v engines: how quaint
By: chrismc Date: November 10, 2012, 7:35 am
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I have owned both stock & mildly modified versions of both
engines in 8v & 16v form for fast road/trackday use.
In stock form the 1800 8v always feels more tractable & torquey-
despite lacking that ultimate 16v top end fizz
Add a 2L block & some fruity headwork & you have a punchy 16v
beater even on stock injection.
I only went to a 16v as it was a better budget trackday engine
out of the box. A good kjet 2L 16v gives that torquey 8v feeling
low down, but keeps revving up top!
I do wonder what my 8v would have been like with some more
compression, x-flow head & ITB's
There was a guy on cgti who spent ££££'s on such a setup but it
never fulfilled its potential. Think he ended up going VR6 :-\
#Post#: 584--------------------------------------------------
Re: 8v engines: how quaint
By: mitlom Date: November 10, 2012, 8:31 am
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The engine that'll be going in my next project Mk1 is a 2ltr
with forged Wiseco pistons, custom machined by JMR, forged rods,
lightened, knifedged and balanced Hotgolf crank. Block has been
decked as well to get correct piston protrusion. On top will be
sitting a JMR X-flow head, based on a US spec OBD1 2ltr head,
fitted with Supertech 40mm inlets and 33mm exhaust valves,
matching uprated dual spring set, titanium caps and solid
follower conversion. Cam is yet to be decided....I have a Kent
GS6 (well actually it is sitting down at Jason's along with
everything else...lol) but Jason and I are thinking we may go
for a custom JMR profile cam instead ;)
Induction will be via Jenvey 45 ITBs on a custom JMR inlet
manifold, haven't decided what we are doing for an exhaust
manifold yet....maybe recruiting a heavily modified Ashley
jobbie....if I can prize it out of Tony B's hands lol.
Management is via a Emerald K3 ecu with custom built loom.
If we don't hit 200bhp out of that setup then next step will be
changing the head for the other one Jason will be doing for
me....another of the same but this time full race with 42mm
inlets and 35mm exhausts ;D
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